There are some fields which you can set as defaults for the buyer in transaction ME21.
Transaction SU01
Input the user name and click Parameters
PID Parameter
value
LIF - Vendor number
BES - Purchase Order Number
BSA - Order type
EKG - Purchasing group
EKO - Purchasing organization
WRK - Plant
LAG - Storage location
MKL - Material group
WAK - Promotion
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