The settings for TAQ and TAN are the same in standard system. You could check it in VOV7.
Normally we provide two sample standard item category groups for BOM creation.
If you are using item category group ERLA in materail master, then the BOM will be created as following:
Main Item TAQ (Pricing)
Sub Item TAE (no pricing)
And if you using item category group LUMF, then the BOM will be created as following:
Main item TAP (no pricing)
Sub Item TAN (Pricing)
Hope it helps.
Thanks and best regards,