Order Amendment Issue

One of my user's is having an issue when trying to close and order via
Order Amendment. He gets a message 'User authority is insufficient to
complete line'. I've verified via 8/PMM, User Authority Parameters, that
he has a record for the company and stockroom of the order in question.
I've given him the highest authority I can give. Does anyone know what
else might cause this issue? Also as a side question, if you leave the
stockroom blank in 8/PMM, does that mean the authority you setup for a
user is good for all stockrooms? Thanks in advance.

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