Defining Settings for Contact and Business Partner Relationships 
You can define whether the relationship between a contact and the default business partner must be retained or deleted, when users change the default business partner.
Perform the following steps in Mobile System Maintenance.
Choose .
Select the CONDELETEDEFAULT parameter; it can have one of the following values:
Update Default
When users change the default business partner, the application retains the relationship with the previous default business partner as a nondefault relationship.
Delete Default
When users change the default business partner, the application deletes the relationship with the previous default business partner.
Select a value that suits your business needs.
Save the changes.
Run ConnTrans to transfer and replicate the changes across all mobile clients.