In a CRM org that is integrated with Veeva Network, Call records are updated by the Network Admin user. What kind of change does the Network Admin user perform on these records?
This can occur if the zvod_Business_Account_vod__c (Location) field is utilized on the Call page. When recording a Call, users select the parent business account of the record they record a Call on. If the parent of the given record is changed, the Child Account is updated by the Network Admin user as expected, and also Call records by replacing the location with the new parent.
CRM Help Documentation: Configuring Call Location