SMOD for IW31 / 32

Hi All Expert,

I want to add a Partner checking for the IW31 when the user input the Customer number using SMOD.

I want to add a checking for the customer credit limit and display the amount when the customer have correct credit.

Have tried ICSV0003 and IW010002, both not work on it.

Please give me some suggestion.

Thank you very much.

Terry