E1 13 Default supplier number to a preventive work order WM

Hi everyone

I want to ask the following, when using preventive maintenance work orders.

We have setted up some PM services for outside maintenances, we have created a model work order and attached a boom with a non stock item representig the service.

After the system generates the work order containing out non stock item, we have to schedule that work order and manually type the supplier number to create a purchase order,

We want to use the supplier price catalog and way to default the supplier number to the work order when is created by the R12807.

Is there any way to accomplish this, meaning defaulting the supplier number?