I have a model driven apps dataverse table in SMART Audit Customer with columns,

art$\_$AccountManager $($lookup column to SMART Audit Auditors table$)$

art$\_$Rep $($lookup column to SMART Audit Auditors table $)$

OwnerId $($owner datatype column system required column$)$

art$\_$Customer $($lookup $-$looking to Customers V$3$table$).$

Write JavaScript to change ownership and define Account Manager and Rep based on related D$365$ customer. If D$365$ Customer is not assigned, make Account manager $=$ Owner.

If assigned,

$$ Account manager $-$ Customers V$3-$ EMPLOYEERESPONSIBLENUMBER

$$ Sales Rep $-$ 'Customer postal addresses' $-$ GROSALESREPGPOPERSONNELNUMBER

$$ Use address where Primary $=$ true

Record ownership:

$$ First use Account Manager, else Sales Rep

In JS$,$ check for nulls for Account manager and rep. If both are null, can't reassign the record.