dynamic Credit check - problem -Delivery creation from Sales order

Hi

we have a problem which i would appreciate some help with.

Sales order is blocked for credit and subsequently released via VKM1

BUT as soon as line item is selected and then Sales document > deliver -

the Dynamic credit block kicks in again straight away, no other changes have been made

why is this occurring ?

I managed to get round the problem by creating delivery via VL10c and selecting line item and then create in background