The possible values are:
- No filter
- Coeff =: The PAC/STK coefficient of the stock line must be identical to the one requested on the document line.
- Coeff <=: The PAC/STK coefficient of the stock line must be lower than or equal to the one requested on the document line.
- Coeff >=: The PAC/STK coefficient of the stock line must be greater than or equal to the one requested on the document line.