Error in BKPF-AWKEY from asset accounting

Hello,

I use asset accounting, when posting value with ABZON, I have a document FI.

I use the document type AA.

when I look at the header of the document FI, i have 0000000003ABC 2011 instead of 1800000003ABC 2011 in the reference field.

I would like the system displays 1800000003ABC 2011 in the reference key field.

Is there a customizing parameter missing?

Furthermore, this field is unmodifiable, how to make this field modifiable?

Thanks a lot for your help,

Kind regards,

Chiachen