Unable to see the service POs while creating Trade Operation

Summary:

When trade operation is created we are trying to link the charge line to the service PO, but the LOV does not show up any POs.

We can also see the Service PO in the Review Purchase Order data screen, but it is not available for selection.

Is there any identifier that needs to be selected on service PO?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):