GI from Vendor consignment

Folks,

Trying to do a vendor consignment goods issue for a STPO.

I keep on getting the following message in VL02N

boldDeficit of SL Unrestricted-use <>qty<> EA : Mat_# Plant_# Sloc_#bold

I have maintained

- Group, rule and assigned them for the plant A (from which material is to be moved to plant B.)

- Assigned the delivery rule The item type 'NLN'

- Assiged the rule to movement type 641

- Applied the stock determination group in Material (Plant/Storage data)

Anything I missed?

Note that the SPTO was created for 10

while stock avaialable was

1 - unrestricted stock

10- Vendor consignment stock

Did the outbound delivery (VL10D) , but unable to post GI (VL02N)

Kindly let me know your thoughts.