SAP ByD - Enhancement PDISetLegalClassCode

Dear experts,

I would like to set up number range format of invoice document base on my Thailand localization requirement. I have digged into the document to do the

Enhancement with  PDISetLegalClassCode  for accomplish this task. However when I have to write a code in

SET_LEGAL_CLS_CODE.absl which was generated from enhancement object creation. I can not use BusinessTransactionDocumentLegalClassificationCode  as it said there are other data type with the same name in different package.

Then I try to add a prefix to indicate that the data type should come from which package.

But It said  prefix AP is not found.

Could someone please share the way or an exmple of using this BADI Enhancement option ?

Best Regards,

Krit R.