How to add phantom item to a work order from script

Hello,
I am trying to add phantom item to a work order via a script.

It throws this error:
{"type":"error.SuiteScriptError","name":"INVALID_FLD_VALUE","message":"You have entered an Invalid Field Value 26.6.2018 1:00 for the following field: plannedissuedate".......

How to avoid this error? Should the date be set in the code (plannedissuedate) and what is the acceptable value for it?

The code is really simple:

objRecord.selectNewLine({ sublistId: "item" });  objRecord.setCurrentSublistValue({ sublistId: 'item', fieldId: 'item', value: '1234' }); //Phantom item  objRecord.setCurrentSublistValue({ sublistId: 'item', fieldId: 'quantity', value: 2 }); //Quantity  objRecord.commitLine({ sublistId: 'item' });  var newObjRecordId = objRecord.save({ enableSourcing: true, ignoreMandatoryFields: false });