Unable to update 'Allow Price Override on Order' column in Contract Lines

Summary:

We are stuck in updating the 'AllowCustomAdjustmentsFlag' in the contract to Y

Scenario1:

for contract WED-213901-1291571, contract id = 300000830804077

We have amended the contract, and updated the 'AllowCustomAdjustmentsFlag'  to Y using REST API,

But since we have to update 360 contracts in all the lines where 'AllowCustomAdjustmentsFlag' is N, so we need to do it via Import management

 

I tried importing through csv for this amended contract

But we are getting error,

The value of the attribute STATUS_CODE isn't valid.

 

So I also tried importing a contract which is in active status

WED-219419-1298092, 300000830710760 contract id

Here the import is getting successful, but in UI the value of 'AllowCustomAdjustmentsFlag'  is not changing.