Field help (DEMTYP1) 

This indicator is used to define the status of the order line that can be Firm or Planned. The Planned status is used to anticipate the firm orders to come because this information is used in terms of the requirements in the MRP calculation. This indicator is no longer modifiable once the order line has been allocated, shipped or invoiced. It is not modifiable if the line is managed by back-to-back order.

If the order line has the status Firm(default value), there is the possibility to allocate it and ship it. Conversely, if the order line has the status Planned, it can be neither allocated nor shipped (it will be necessary to manually modify its status to pass to Firm).