Intercompany Revenue - Not able to see Contract Line in LOV while creating Event

Summary:

I have a scenario where I have to create a Global Intercompany Contract

Example - Contracr - INT03

Invoice Method - Intercompany Transfer Invoice

Revenue Method - I created a separate revenue method that too amount based and enabled it for Intercompany.

Later i created cross charge transaction and the invoice cycle till the AP of Receiver BU completed successfully.

Now as per the Business requirement we have to book Intercompany Revenue based on amount.

Issue - While creating manula Event for Intecomoany Contract I am not getting Contract line in List of Values.

What could be the reason for not getting Contract line in LOV while creating Event for Provider BU where contract line is a mandatory filed.