When you manually load a phase from the unit module faceplate, the Phase Owner is automatically changed from DeltaV Batch to External. This takes control of the phase away from DeltaV Batch and gives it to an external owner, which, in this case, is you. (You need to have the Restricted Control key to be able to do this. Keys are assigned in the User Manager.)
After manipulating phases using external control, you will need to unload them so they will return to DeltaV Batch control. This is important because later, when you run recipes that use these unit modules, the modules must be under DeltaV Batch control. To be able to unload a phase, it must be in the Idle state, so remember to issue a Reset command after the phase completes.