10000445 
Message
In "DPM" (down payment) amount field, enter amount greater than 0
Diagnosis
For either sales or purchasing, you have attempted to add a down payment invoice or down payment request, but in the DPM (down payment) amount field, you have entered an amount that is 0 or less.
Procedure
In the DPM (down payment) field, enter an amount that is greater than 0.