Hi Donald,
This field is controlled by the user parameter "EVO" f.evalue f.e. 01 and the setting in the customizing for this value:
Purchasing -> Environment Data -> Define Default Values for Buyers -> Settings for Default Values -> f.e. "01" -> field "InfoUpdate".
There are 2 steps to change the "InfoUpdate" field default setting.
Step1: You need to setup defaults per buyer in IMG -> MM -> Purchasing -> Environment data -> Define default values for buyers, and go into "Settings for Default Values"(or Trasaction code: OMFI).
Then click the existing default value and you will see setting about InfoUpdate in the tab of "Indicator". You can set the value of Purchase Order to " "(blank) if you don't want info record updated when PO created.
Step2: You can assign your users to the groups, you just define by going into the second function; "Maintain Users". (or Trasaction code: SU01.) Choose tab "Parameters" and enter parameter "EVO" along withvalue which you edited in step1.
Kind Regards,
Mauro