on the selection screen i should provide validations on some fields.for example if invalid position is entered in the position field, a warning message that 'invalid position' should be displayed.i used the event AT SELECTION SCREEN ON FIELDNAME.it was working but after the warning message is displayed all the fields except position field becomes uneditable or output only.so iam not able to enter the values in rest of the fields.can i use chain and endchain statement here or is there some other way.please provide some sample code.
thanks.
