Look for online documentation, you can use Abap in an exit for validation rule that couldn't be formulated with the tool.
Ref: User Exits in Validations/Substitutions/Rules
Regards,
Raymond
Look for online documentation, you can use Abap in an exit for validation rule that couldn't be formulated with the tool.
Ref: User Exits in Validations/Substitutions/Rules
Regards,
Raymond