partial qty reversal of PGI

Dear Friends

We have a business requirement to reverse the partial quantity after PGI

Means delivery is 10 units--picking is 10 units--pgi is 10 units

The requirement is thro VL09 we need to reverse only 5 quantities out of the 10 PGIed

According to my knowledge

It is not possible

We have to reverse the entire qty and then delete the delivery and create a fresh delivery for 5 units

I would like to know is there any way out without going thro the standard process?

Note This issue was searched by me in the forum and couldnot find any relevant threads or answers and hence posted

Waiting for the opinions from all the members

Regards

Raja