SmartForm Interface: Import Parameters, Tables and Global Data

Explanation

The SmartForm interface defines what data the driver program passes to the form. Header data is usually passed as an importing structure. Item data is usually passed as an internal table. Global definitions inside the form can be used for helper variables, but they should not replace a clean interface. A common production issue is a blank field in the form because the driver did not fill the interface parameter or the form node refers to the wrong field name. Good SmartForm design starts with a clean form interface and final output structures.

Code example

* Purpose:* Prepare clean header and item data before passing to SmartForm interface.* This avoids layout logic depending on raw database tables. TYPES: BEGIN OF ty_po_header,         ebeln TYPE ebeln,         lifnr TYPE lifnr,         name1 TYPE name1,         bedat TYPE bedat,       END OF ty_po_header. TYPES: BEGIN OF ty_po_item,         ebelp TYPE ebelp,         matnr TYPE matnr,         maktx TYPE maktx,         menge TYPE menge_d,       END OF ty_po_item. DATA ls_po_header TYPE ty_po_header.DATA lt_po_items  TYPE STANDARD TABLE OF ty_po_item. * Fill final print structures in driverls_po_header-ebeln = p_ebeln.ls_po_header-lifnr = lv_lifnr.ls_po_header-name1 = lv_vendor_name. * Pass ls_po_header and lt_po_items to SmartForm interface* In SmartForm, use IS_PO_HEADER and IT_PO_ITEMS.

Real project scenario

A purchase order SmartForm receives PO header, vendor address, item table and terms text from the driver. The form only displays the received data.

Common mistakes

- Passing incomplete structures. - Using different field names in driver and form. - Using global form variables instead of interface parameters. - Passing too much unnecessary data.

Best practices

- Use clear interface parameter names. - Pass final prepared data. - Keep global data minimal. - Use structures matching form display need.

Interview angle

A good answer should say that the interface is the contract between driver program and SmartForm.