Field help (AGACACC) 

Account number that is used to identify it in the chart of accounts.
The codification of the account depends on the format and length options applied during the setup of the chart of accounts. 

SEEINFO Two accounts can share the same code but they cannot be part of the same chart.

If the account numbering with fixed length option is retained, the account numbers entered will automatically be completed with "0"s up to the length defined in the setup.