When trying to add a subscription line using the new add-on items feature i cannot seem to resolve the following error: "error.SuiteScriptError","name":"USER_ERROR","message":"Voer een waarde/waardes in voor: Regeltype, Facturatiemodus" this translates to: please enter a value for LineType and BillingMode, both of which are set in code but do not seem to register on the object whenever i print it before trying to save. any suggestions?