How to chek some fields of the Invoice Summary Customer Master Data?

Hi, everyone,

I want to check some fields of the Invoice Summary Customer Master Data when I save the BP master, and I have found a BADI that sees to match my requirement.

Enhancement spot: ISJP

BADI: ISJP_CUST (Invoice Summary Customer Master Data)

I create an implementation of this BADI, and set a break point in the BADI implementation class, but when I save the BP, I can't see the SAP debugger window at all. Why? (#I have active the enhancement implementation.)

Can anyone give me some help, please.

Yours,TOM