Field help (BUY1) 

When the BUYFLT - Filter by buyer parameter (ACH chapter, AUZ group) is set to Yes, the Buyer code is set to the user code and its entry is mandatory.

SEEWARNINGDepending on the entry transaction used, this field may be hidden. In this case, it is the user code that is used as default value.

From this field, the Actions icon gives you access to the supplier's detailed address and can be used to select an alternative address for the supplier if necessary. This is the address to which the order document will be sent.