You can view the costs of a line maintenance work package on the Line Maintenance Work Package Commercials page. Cost line pricing, prerequisites, and finance transaction fields follow the same rules as hangar work package commercials.
See View Work Package Commercials for full details on how cost lines and planning lines are derived on hangar work packages, and for descriptions of finance fields on each cost line.
Each cost line includes Task Transaction ID, Transaction Status, Finally Posted, Transaction Source, and Inventory Transaction ID (for materials). Click Task Transaction ID to open the related aviation task transaction, or run Check and Update Accounting when reposting is needed. See Check and Update Accounting of Transaction.