Field help (PJTPOI) 

The project code entered on the header is used to initialize by default the project code on each line of the buyer plan.
This field is managed depending on the setup of the entry transaction of the subcontract order. The management of this code also depends on the value of the CTLOPPCOD - Mandatory project control parameter (TC chapter - MIS group).

This project code can still be modified in the lines.
If the loading of lines is done with the Requirements to consider action, all lines that meet the entered criteria are selected regardless of the project code entered on the header. This is not an implicit selection criteria, even in a single project context (the parameter PJTSNGDOC - One project per document (TC chapter, MIS group) is set to Yes).

This parameter has an influence on the generated orders:

In creation mode, when no order line is entered, analytical dimensions are reinitialized according to the by the setup of default dimensions when the project code is modified.
In creation mode as well as in modification mode, if an order line has already been entered and the project code is modified, analytical dimensions are not reinitialized.