I have $3$ tables in my model driven apps.

Smart Audit Customers, Customers V$3($mserp$)$ and Company Chains $($mserp$).$

In Smart Audit Customers, i have arb$\_$customer $($lookup to Customers V$3$ table$),$ arg$\_$type $($a text column$).$

In Customers V$3($mserp$),$ i have mserp$\_$companychain $($text column$).$

In Company Chains $($mserp$),$ i have mserp$\_$chainname and mserp$\_$chaindescription both text.

write js in smart audit customers form so that arg$\_$type should be populated.

When arg$\_$customer field is updated:

Get Company Chain $($mserp$\_$companychain$),$ from Customers V$3($arb$\_$customer$).$

Match Company Chain to Chain $($mserp$\_$chainname$)$ on company chains entity $($ARBsmmCompanyChainEntity$)$ to get record. Populate Type $($arg$\_$type$)$ on Smart Audit Customer using Description $($mserp$\_$chaindescription$)$ from record.