Rusheek,
xxxxx and yyyyy should have same
reference numbers according to our business requirement , but
actually in our standard system maybe due to bug , these accounting
documents have different reference numbers.
These accounting documents are created
when I canceled intercompany billing document . through message type
INVOIC(idoc) , IC accounting document is created .
In your case, the two accounting documents have different billing documents, that is why these two accounting documents have different reference numbers!
Is there any another issue? or I have not understood the query?