Make Column B read only if there is value in Column A

Summary:

Hi All,

The requirement is as below:

For the account available in the rows, if the finance department user enters a value in column A, then column B (where the department user makes the input) should be read-only for the same account.

I am using groovy to achieve the requirement, but please let me know if there is any native functionality available to achieve the same.

I used the following code to capture the accounts in a list where the finance department has input the value in Column A:

List Accts = []

operation.grid.dataCellIterator().each{

if(it.getMemberName("Plan Element") == "CO_Input"){