It can take the following values:
- No: the operation is never sub-contracted. The sub-contracting product and the sub-contracting work center cannot be assigned,
- Structural: the operation is systematically sub-contracted. The factory does not have the required skills or toolings. The sub-contracting product is mandatory and the sub-contracting work center cannot be assigned. it is loaded with the principal work center, which, in this case, must be of the sub-contracting type.
- Temporary (conjuncture related): the operation is carried out internally in priority, but in case of overload or temporary problem, it can be sub-contracted. The sub-contracting product and the sub-contracting work center can be assigned and are mandatory.