Credit Release thru VKM3 remove the schedule line delivery block ...

HI Gurus,

I have created the sales order with the delivery block at the schedule line. i have save the order . The order goes to the credit block . So when i release credit block with the help of VKM3 then system also removes the schedule line level block.

This is not std behaviour . Can any one come across such scenario ?

Details: I have removed the routine 101 in the OVB8 so that if order goes to credit block still order will have the confirm qty.

Also in the OVAK order type is mark D for automatic credit check.

Thanks in advance