The CTAPI Manifest Entry Input web service is modeled after the Solomon Screen: 40.115.00
The recommended and quickest way to implement is to use the ctDynamicsSL.orderManagement.input.manifestEntry.screen object which contains all necessary objects to create or edit a manifest entry.

All necessary pv lookups are available in the service.
Examples:
public ctDynamicsSL.FrtTerms[] getFrtTermsByID(String frtTermsID)
public ctDynamicsSL.ShipVia[] getShipViaIDsByID(String shipViaID)

and more...

Contact Catalina for sample code for calling this webservice

Programmers Reference for: ctDynamicsSL.orderManagement.input.manifestEntry