Using Sum field in Sap script
I am trying to add content of field (Tax VAT) in sap script and put into another symbol using following command
/:SUMMING program symbol INTO sum symbol
but after running me22n tcode to display the PO error occured
<b>Overwriting a protected field</b>Error analysis
The program tried to assign a new value to the field "<SM_SUM>" even though
it is protected against changes.
I am modifying medruck std PO script and using standard prog. for it i.e. SAPFM06P.
Please tell me wheather it is necessary to make sum symbol dynamically define in SAPFM06P and how to do this.