From version 3.22 we have added a feature for dealing with LNG Heel Management. 

Under the LNG tab in the TC contract screens we have added 4 fields for capturing heel quantity and price for both Delivery and Redelivery:

Once added into the contract, the Accounts Receivable (for TC out) and Hire Payable (for TC in) will pick up the amounts to be invoiced.

For TC out contracts the following logic applies:

For TC in contracts the following logic applies: