CALL_FUNCTION_CONFLICT_TYPE — CALL_FUNCTION_CONFLICT_TYPE Dump Causes and Fix
CALL_FUNCTION_CONFLICT_TYPE fires when a CALL FUNCTION statement passes an actual parameter whose ABAP type does not match the formal parameter's type defined in the function module interface. It is almost always seen with RFC calls between systems on different transport levels, or with dynamic CALL FUNCTION using a parameter table built at runtime. Fix the interface mismatch at the source; do not wrap the call in a blanket exception handler.
This page covers the CALL_FUNCTION_CONFLICT_TYPE runtime error, which signals a type mismatch between the caller and the function module interface at the moment of the call. It walks through the real causes seen in production, mostly RFC version drift and dynamic parameter construction, and gives the diagnostic order for ST22 and the resolution branch by cause.
Published 16 Sept 2026· 1,285 words
What the dump means
This dump is raised by the ABAP runtime the instant a CALL FUNCTION statement is executed and the actual parameter supplied by the caller does not have the same type as the formal parameter declared in the function module's interface. It is a type conflict, not a length conflict (that is a separate dump, CALL_FUNCTION_CONFLICT_LENG). Static calls where both sides are compiled together rarely produce this, because the compiler checks types at syntax time. It shows up almost exclusively where the check can only happen at runtime: RFC calls, where the callee interface lives on a different system and cannot be checked at compile time on the caller's side, and dynamic CALL FUNCTION statements built with a parameter name and a generic reference or field symbol whose concrete type is only known when the statement executes. The dump means the two sides genuinely disagree about what type a named parameter is.
Root causes that actually produce it
- Interface version drift across an RFC connection: the function module was changed (a parameter's type altered, a structure swapped, a new append added ahead of an existing field) on one system and the transport carrying that change has not reached the system on the other end of the RFC destination. The caller was generated or compiled against one version, the callee runs another.
- Dynamic CALL FUNCTION with a parameter table: code builds the EXPORTING or CHANGING parameters at runtime from a table of name/value pairs, and the value assigned to a given parameter name has a type that does not match what the interface actually expects for that name. Common in generic frameworks, workflow containers, and BAdI dispatchers that construct calls from configuration.
- TABLES or CHANGING parameter with a mismatched line type: an internal table is declared locally with one structure (often a generic or customer-appended structure) while the function module interface expects a different, more specific structure, typically after a BAPI extension structure was regenerated with a different field order or type.
- Field symbol or generic data reference passed as an actual parameter: the field symbol was assigned a runtime type incompatible with the formal parameter's declared type, common where ASSIGN COMPONENT or dynamic ASSIGN is used ahead of the call.
- Local wrapper or proxy class not regenerated after an interface change: a Z wrapper class or an old RFC proxy still reflects the previous signature of the function module and passes an obsolete parameter type.
- Cross-system calls to standard BAPIs after an upgrade or support package on only one side, where SAP itself widened or changed a parameter type and the two systems are momentarily out of step.
What to inspect in ST22
- Short text and error analysis at the top of the dump: it names both the calling function module or program and the callee, and states which named parameter is in conflict.
- The 'What happened' and 'Error analysis' text block: it gives the parameter name exactly as declared in the interface, useful when the caller uses a different local variable name.
- Source code section, position of the CALL FUNCTION statement: check whether it is a static call (fixed function name) or dynamic (function name and parameters built as variables) — this immediately narrows the search to compile-time-invisible mismatches.
- Active calls and system fields: if the call crosses an RFC destination, the destination name appears in the call stack; note it before doing anything else.
- Variable values section: shows the actual value and, where available, the runtime type of the variable that was passed, compare this against the interface definition in SE37 on both source and target systems.
- Follow up in SE37 on both systems (if RFC) to diff the interface parameter types, and in SE24/SE80 for the calling wrapper class if one exists, then check the transport logs for the function group involved.
Resolution path
If the cause is RFC version drift, align the two systems: identify the transport that changed the function module interface and confirm it has been imported into the system on the other end of the destination, this is a transport dependency issue, not a code bug, and needs coordination with the basis or release team rather than a code change. If the cause is a dynamic CALL FUNCTION passing a mismatched type from a parameter table, correct the value construction so its type matches the interface, this is an ABAP code fix and needs a change request through normal transport. If the cause is a TABLES or CHANGING parameter with the wrong line type, correct the local table declaration to use the exact structure required by the interface, verified against the function module's current signature, again a code change requiring transport. If a wrapper class or proxy is stale, regenerate it and re-release it. In all code-change cases, treat the dump as a signal to check every other call site of the same function module, because a single interface change usually breaks more than one caller.
The fix people try first (and why it fails)
The common reflex is to wrap the CALL FUNCTION in a TRY/CATCH for a generic exception class, or to add a blanket short dump handler around the job step, and call it resolved because the job no longer terminates hard. This hides the failure instead of fixing it: the function module never executes, the business data is never processed, and the job now finishes 'successfully' with silently missing results. Another frequent but wrong move is force-casting the actual parameter to match the formal type without checking why the types diverged, which can mask a genuine data model mismatch and corrupt the value that eventually reaches the callee.
Prevention
For RFC scenarios, keep transport landscapes for both sides of an RFC destination synchronized and treat any interface change to a widely-called function module as requiring a coordinated release across all consuming systems, not a single-system transport. For dynamic CALL FUNCTION patterns, add explicit type checks or use typed wrapper structures instead of raw parameter tables where the calling code is under active development. Regenerate any local proxy or wrapper class as part of the same transport that changes the underlying function module interface, and include an interface diff check in the transport request review for custom RFC-enabled function modules.
Whose problem this is
ABAP development owns the fix when the cause is a code-level type mismatch or a stale wrapper. Basis or the transport/release coordinator owns it when the cause is interface version drift across an RFC destination. The handover note should state the function module name, the parameter in conflict, whether the call is static or dynamic, the RFC destination and both system IDs involved, and the transport request that last changed the interface.
Related SAP objects
Reviewed pages this object connects to in the ERPClimb knowledge graph.
Source: ERPClimb — https://erpclimb.com/sap-abap-dumps/call-function-conflict-typeERPClimb is an independent platform and is not affiliated with SAP SE. Reference pages are written and reviewed by SAP consultants for learning and troubleshooting.