Driver Program Pattern for Adobe Forms

Explanation

The driver program is responsible for collecting data, applying business logic, formatting output structures and calling the Adobe Form. A weak driver mixes SELECT statements, form call, calculations and error handling in one block. A strong driver separates validation, data fetch, data preparation and form call. This makes Adobe Forms easier to debug and reuse. The driver should also handle output parameters such as preview, print, spool or PDF return.

Code example

* Purpose:* Clean driver program flow for Adobe Forms.* Each step has one responsibility. START-OF-SELECTION.  * Step 1: Validate input document number PERFORM validate_input.  * Step 2: Fetch required business data from SAP tables or APIs PERFORM fetch_data.  * Step 3: Prepare final output structures for form interface PERFORM prepare_form_data.  * Step 4: Call Adobe Form only after data is complete PERFORM call_adobe_form. FORM call_adobe_form.  DATA lv_fm_name TYPE rs38l_fnam.  CALL FUNCTION 'FP_FUNCTION_MODULE_NAME' EXPORTING i_name = 'ZDELIVERY_NOTE_FORM' IMPORTING e_funcname = lv_fm_name.  * Generated FM is called dynamically to avoid hardcoding CALL FUNCTION lv_fm_name EXPORTING is_delivery_header = gs_header it_delivery_items = gt_items. ENDFORM.

Real project scenario

A delivery note Adobe Form was failing for some deliveries. Refactoring the driver into fetch_header, fetch_items, prepare_texts and call_form made the missing data issue easy to locate.

Common mistakes

- Writing all logic in one block. - Calling form before data is fully prepared. - Hardcoding form function module. - Not separating fetch and display responsibilities.

Best practices

- Separate validation, fetch, preparation and form call. - Use print-ready output structures. - Keep form call isolated. - Handle exceptions and output parameters clearly.

Interview angle

A senior answer should explain how the driver program prepares data and keeps the form layout simple.