Hi Sandeep
When we do the complete GR for our production order then system will update the status DLV as indicating that all the targeted goods are received completely. Otherwise we will updates the DLV in the case when there is shortage in production output and further no goods will comes to GR by checking the Goods Receipt in production order goods receipt tab.
Check status changes in production order then we can identify how it got changed.
Regards
Kesava