Set value in TEXT field in invoice line item while importing Invoice.

Hi All,

I am using SDO (Sage Data Object)  to import invoices in Sage 50 UK. I would like to pass a multiline text in the details(Text) field. I tried many ways but unable to set value in that field. I tried to pass simple text but the value does not populate in the sage invoice.

objInvoiceItem = (InvoiceItem)objWorkSpace.CreateObject("InvoiceItem"); 
objInvoicePost = (InvoicePost)objWorkSpace.CreateObject("InvoicePost"); 

setInvoiceItemValue(objInvoiceItem, "TEXT", "test detail text" 1);

I tried all invoice types "product invoice", "service invoice" but unable to. Can you please help me with this? 

Regards,

Pinkesh