I am modifying a sapscript from NACE in WE03.(The form name is WESCHEINVERS5). I have to modify the layout for Return delivary slip (to vendor). There is already an existing layout for Goods Receipt note in the same form wherein the movement type is 101. For Return delivery slip, the movement type is 122 and I need to change the header part (window - KOPF). Since this is the first time, i am doing sapscripts, I dont know at which place i should write the code.Can anybody help me out.