posting packing slip cannot be performed prior to the purchase order being posted

While posting receipt list I am getting below error even after post the purchase order in ax-2009

posting packing slip cannot be performed prior to the purchase order being posted , Please contact purchasing with this error message and the purchase order number.

Please help me.

Thanks in advance

seems to be the customization, It’s better contacting somebody from your team

Yes , Due to quantity mismatch I am getting this error.

Now ii’s working fine.

Thanks