Hello Simone
Generally, when there are several production versions created for a material and for a phantom, system will try to read the phantom productionve with the same key than the finished product PV.
For example, if there are production versions 0001 and 0002 for the finished product and you select version 0002 for the finished product, system will first try to read version 0002 for the phantom. If it does not exist, then it reads the first available. Please observe that you must define on the material master that the BOM should be selected according to the PV.
BR
Caetano