Update partner function before saving Customer (XD01/XD02)

Hello Experts,

I need to update my partner function table in Sales Area Data of Customer Master (XD01/XD02)

before saving the customer. Is there any exit where I can do that.

I tried using Enhancement SAPMF02D. Exit - EXIT_SAPMF02D_001. Where I modified the table T_KNVP. But, it again defaults to its original value.

Any help is appreaciated.

Regards,

DNP