Reversal Document Icon in FB03

hi experts,

I have done one enhancement in Include RV60BFZA

When i set the RULE_NEW_CANCEL = 'A'

then the document is Reverce poperly but the Icon for Reverce Document in FB03 is not Displayed.

When i set the RULE_NEW_CANCEL = 'B' or when i set RULE_NEW_CANCEL = ' '

then the Icon for Reverce Document in FB03 is Displayed but extra Accounting Entry of Billing Document is genrating at VF11 (Invoice Cancelation SD)

If you have the solution for this Please Suggest .

Thanks in Advance,

Nilesh.