How is Asset Category derived for a single Asset Book

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Hi,

We have only 1 Asset Book. We want the transfer from Payables to Fixed Assets to automatically derive the Asset Category based on the Asset Clearing Account matching on both the Asset Category and the AP invoice distribution account.

What GL segments are checked for the Asset Category being automatically derived (i.e. the match on both the Asset Category and the AP invoice distribution account):

1. The entire GL account code combination (all segments), or

2. Only the Balancing Segment, Cost Centre & Natural Account segments?

Again, we only have 1 Asset Book so deriving Asset Book is not an issue.