Cannot set entity in intercompany journal entry...

Hi-

I am trying to set the customer in a scripted intercomnay journal entry (id 32000), and I keep comming up with a strange error...

SAMPLE CODE (adding a customer (internal ID 1672) to an exisitng intercompany JE:
icje2 = nlapiLoadRecord('intercompanyjournalentry', 32000)
icje2.setLineItemValue('line','entity', 2, 1672);
var icjeid2 = nlapiSubmitRecord(icje2, true, true);

This throws the error:
INVALID_KEY_OR_REF
Invalid entity reference key 1672 for linesubsidiary 2.

SAMPLE CODE (reading and then adding customer (internal ID 1672) to an exisitng intercompany JE:
icje2 = nlapiLoadRecord('intercompanyjournalentry', 32000)
var testme = icje2.getLineItemValue('line','entity', 2);
alert (testme); // this gives 1672
icje2.setLineItemValue('line','entity', 2, testme);
var icjeid2 = nlapiSubmitRecord(icje2, true, true);