External Supplier Registration requests are getting auto-rejected randomly

Summary:

We have some mandatory DFFs to be filled up by Supplier during external registration process. We have our approval workflows defined on basis of these DFFs. What we have observed is that very randomly, one or two of the registration requests get auto-rejected and reason being that the mandatory DFFs have become null after the user has initially populated them during the registration process. It is only after the registration has completed that we find these registration getting rejected. As a result, the user has to go back into the registration and enter a value for those required DFF and