The length of fields, being mandatory is configurable through the customizing. That information is read during transaction runtime so the field itself doesn´t know whether it´s e. g. mandatory or not. The same is true for other transactions.
The number of fields may also change during support package implementations or if you activate an additional function through the switch framework.
To find out all the tables being read during e. g. a "master data creation" you could activate and SQL trace in ST05 and check all the tables that are read and data inserted.
Markus
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