Discount Error when creation Goods Receipt PO & AP Credit Memo

Dear Experts,

I have upgraded a client from version 2007 A to 9.1 PL 07. End users are currently doing some tests. Two users have the following error

1. One of the users is trying to create a Service Goods receipt PO from a Service Purchase Order. The goods receipt PO is a partial receipt therefore the user is putting the partial value on the total column (This is the normal business process they follow).

Note: The Purchase order total column is 19375.00, the partial goods receipt PO total column is 6960.00. The unit price in the goods receipt PO remains the same as the total of the PO (19375.00). This therefore generates a discount of 68.04 because the total column and unit price column are different. In version 2007 A, this is allowed. However in the upgraded version 9.1 PL 07 the following error is generated

[Goods Receipt PO - Rows - Discount % per Row][line:1],'You are not permitted to perform this action' [Message 200-30]

2. Another user is also trying to add a Service AP Credit memo with discounts and is getting the same error as above

[A/P Credit Memo - Rows - Discount % per Row][line:1],'You are not permitted to perform this action' [Message 200-30]

Do I have to give authorizations to the above users mentioned? I have tried to give Max. Discount Purchase =100.00 at the bottom of the general authorizations window for each user but it is not working

Kindly assist. Thank You

Regards,

Pascale