ABAP Runtime Environment (BC-ABA)

A conversion routine CONV (also known as conversion exit) is represented by two function modules that adhere to the naming convention CONVERSION_EXIT_CONV_INPUT|OUTPUT. In these function modules, no statements can be executed that interrupt the program flow or end a SAP LUW. A conversion routine can be assigned to a domain in the ABAP Dictionary. If a screen field refers to a domain with a conversion routine, or is directly assigned a conversion routine in its attributes, the system automatically executes the function module ..._INPUT for every input in the relevant screen field and the function module ..._OUTPUT when values are displayed in this screen field and uses the converted content in each case. If a data object refers to such a domain, the function module ..._OUTPUT is executed for the output of the data object using WRITE or WRITE TO and the converted content is displayed. Conversion routines cannot be dedugged before Release 6.40.