I have created a contract with valuation based on Quantity. I have quantity as 10, i created a valuation for quantity 5 and certify > create supplier invoice and match. No problem.

When i try to create a new valuation and enter 5 remaining qty, the valuation is created and certified value is picked for 5 quantity but when i try to Certify it says , The Net Certified value is 0, Certification is not allowed.

i did check the Net Certified Value and it is 5000. ( 1000 per item rate),