Default storage location for plant

Hi All,

I am having one issue

Currently the default storage location for orders is 1000 for plants 1001 and 1002. Remove the default storage location for these plants so the default storage location on the orders is blank.This is needed in QA for further testing of ATP changes.

So i done the changes in OVL3 T code. I removed the storage location for the plants 1001 and 1002.In sales order level it is appearing blank but when executing VL06P which stops the delivery process.

Now my question is if i want to do at sales order level what settings i need to do

Thanks in advance

Sunny