In this work step, you can define the serialization attributes of individual movement types or movement type groups.
Maintaing this setting is only necessary if you think the assignment of the serialization attributes at operation level is too rough.
For example, you can define serial number usage 'can' in the serial number profile for the serialization procedure using the key 'MMSL' (maintain goods issue and receipt document).
For certain movement types, however, you want to ensure that serial numbers must be used.
To do this, you could define a movement type group here with the corresponding assignments and assign this movement type group to the required movement types in the next step.
You should only perform settings if you really require control of the serialization attributes which is specifc to the movement type.
If you do not assign any movement type group to a movement type, the system always uses the definitions from the serial number profile which are defined for each operation key.