I'm using EXIT_SAPMF02D_001 for customer change to display an error message after validating the TAXNUMBER3 (GSTIN, kna1-stcd3)
The error message is displayed but the active tab on the screen changes from 'Control' to 'withholding tax.
Does anyone know why this is happening and how to stop it happening?
This issue can be recreated in SAP by putting this line of code into EXIT_SAPMF02D_001 :
message 'test' type 'E'.
Then change a customer in XD02 and press save.