Issue while making the Item Master field as mandatory in Contracts

Go to Navigator -> Contracts

Go to -> ‘Create’

Select ‘Type’ and after selecting ‘Item Master’ field will be visible

Requirement - ‘Item Master’ filed needs to be defaulted to ‘Hitachi Master’

Now Go to Navigator ->Configuration -> Sandboxes

Create a Sandboxes and Enter Sandbox

Add tools Page Composer, Application Composer

Navigating to same contract page as above inside Sandbox

Select tool -> Page Composer

Here we are not getting the option of ‘Item master’ field .

Eventually not getting any fields from the below popup