Invalid value specified for the parameter

Invalid value specified for the parameter

Hi,

I cannot access purchase order item, so I cannot access the most important option for us. People that works with me attached all bills on purchase orders, so I cannot make any payment for my suppliers instead I call for all of them and ask to resend me a bill.

When I try to access it appears that message:  Invalid value specified for the parameter cf_pagamento_1.

I suppose that is a simple thing to fix but I've being trying for hours without success.

Would some one help me with this in an urgent matter please!

Thank you.