Version
6.6, not the version-specific
Issue
Not able to change the Return date of the product and getting the error "Zero value items should be Allow Zero Price", below is the screenshot for the same:
Resolution
We found that Option "Zero Value" for the product was checked which was causing the error "Zero value items should be Allow Zero Price".
So we suggested unmarking this check box and then the customer will be able to change the return date for the items. Below is the screenshot for the same:
The customer should have admin rights to update the product to do the needful on the same.
This KB article concludes here.