10000180 
Message
Specify valid tax code
Diagnosis
You have opened a sales or purchasing document containing one or more items linked to a tax code, but your company has not set up the tax code correctly.
Procedure
Note
Ask your superuser to follow the steps below.
End of the note.
Choose
Administration 
Setup Financials Tax Tax Groups 
.Make sure the required tax code's effective from date and rate are valid.