Delivery Completion Indicator- Control?

Hi all,

In our organization we have defined the release strategy in such a way that, we are having 8 release codes in a release strategy,, by means of release indicator blocked and released,,,once the PO was released bythe initial hierarchy release indicator is set as blocked i.e we cant do any changes to the PO.

Requirement is I hv created a PO for 10 quantity.

Received only 04 quantity,,, by this time vendor told that he cant supply the balance quantity,,, so want to short close the PO. so set the delivery completion indicator during GR time,,, by which the Header status in PO was changed like this. Ordered -10, delivered -4, still to be delivered -0. This is what exactly we require,,, bur our end user try to do GR for the balance 6 items for the same PO,,, it has taken in even we set the delivery completion indicator,,,

Why this indicator is not having control?system should not allow us to do further GR if this indicator is set,, even its allowing us do, how to overcome this?

If ur suggestion is try to short close the PO by changing the ordered qty to 4,,, this is not possible in our business scenario as v r having typical release procedure as explained above. help me out

regards,

urendra