Error while doing Vendor Return Delivery

Dear Gurus,

When i am making vendor return delivery( From Unrestric Stock) getting error like below:

<b>Insufficient Quantity in the Register RGSUM</b>

Quantity in the register is the difference between Receipts and Issues. Since for the particular material type and excise group there may not enough balance.

Procedure

1. Check Table J_1IRGSUM.

2. Create Receipt enter the register for the excise group.

Could you plz guide me to overcome this problem.

Regards,

Venkat