AR Invoice Posting rule - update Customer Number

Kinetic ERP
1

Hello,

I see in AP invoice posting rule, we can set Vendor Number through Vendor Ref variable then after posting the VendorNum in GLJrnDtl is updated.

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So how can I update Customer Number (CustNum) when posting AR Invoice ? Is there a system defined Customer Ref variable like Vendor Ref to set the value of Customer Number?
I am using Kinetic 2023.2.
Thanks for your help .