Basically, what I need to do is get at the Billing Transactions:Internal Id field in a script for searching.
I have a saved Transaction search, where type = Purchase Order. I need to get the PO internalid AND the Billing Transaction: Internal Id. The saved search is fine.
Because in script the nlapiSearchRecord can only get one record, and I have over 9,000 rows, I am doing a loop where I am adding a filter of internalid >= the last internalId of the previous execution (1,000 rows). However, I need the filter for this search to be on the Billing Transaction:Internal Id NOT the PO Internal ID.
What "field" can I use in the nlobjSearchFilter creation to get the Billing Transaction:Internal Id?