For Motors with Resolvers were we do not have Encoder Memory, B&R takes care of the mounting orientation and sets it up to an comutation angle of 0.
For Motors with an Encoder Memory we do only messure the commutation angle in the factory and write the data into the electric Nameplate/Encoder Storage. An B&R drive will use the data, and it will not be a problem that the angle is not 0.
As the Encoder-Data Fromat is not Stanardised between Manufacturers it may end up in an situation were the 3rd Party Drive was not able to read the Data.