Substitute customer# using user exit on PCA doc

Hi All,

We have a requirement to populate Customer# on the Profit Center document which is not happening through standard program (for rebate processing). We are using 4.7 and PCA module.

We are using a FI substitution calling user exit. What we intend to do is substitute customer# on Accounting doc (Assignment field of BSEG) and also substitute Customer# on GLPCA-KUNNR field (Customer field) of PCA document.

We have written the user exit and it is working fine up to substitution on BSEG field on Accounting doc. However the customer# is NOT getting populated on PCA document.

any ideas in this regard are highly appreciated.

thanx