Mr Shiva Ramakrishnan is Right.
This Note 1498611 will help you.
As you are creating Excise w.r.t. Order related Performa Invoice, system throwing this error.
You have to bypass this error msg as warning msg.
SPRO--Logistic General--Tax On Goods Movement--India--Tools--Mesage Control
here you check whether your error msg with Application Area(8I) and Msg No(681) is there or not.
If there Change Message Type (MT) from E=Error to W= Warning
If Not then you have to create the same with warning Message.
Regards:
Jena