problem with 'lookup on' and writing to a SQLserver table

[brian_matthewsbrian matthews]

I have never used this list before so am not completely sure what to expect 
so here goes : I am trying to write to a SQLserver table from a field 
process procedure but the row is blocked if a 'lookup on' is also present on 
the field, can anyone explain this, or offer a wokaround ?

P.S we are from RMS and trying out SQLserver

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