Use RECID as primary key in OpenEdge TEMP-TABLE

I would like to create a dataset containing a couple of temp-tables that are filled by an xml file.

DEF TEMP-TABLE ttOrder NO-UNDO
FIELD iOrderNo AS INT
FIELD iOrderDate AS DATE
INDEX ix RECID. // This also won't work, but this is needed to use the `OF` statement when retrieving records.

DEF TEMP-TABLE ttOrderLine NO-UNDO
FIELD iParent AS RECID
FIELD iArticleNo AS INT
FIELD dPrice AS DECIMAL.

DEF DATASET dsOrder FOR ttOrder, ttOrderLine
DATA-RELATION Order_OrderLine FOR ttOrder, ttOrderLine
RELATION-FIELDS ttOrder.RECID, ttOrderLine.iParent. // This is what won't work, but what I would like to do.


Usually I would just create an iOrderNo field in ttOrderLine and match that in the datasets RELATION-FIELDS attribute. Since the data is loaded from an XML file, this will be tough.

The end goal is that instead of this:

FIND FIRST ttOrder.
FOR EACH ttOrderLine WHERE ttOrderLine.iParent = RECID(ttOrder):
// Do something
END.


I would like to do this:

FIND FIRST ttOrder.
FOR EACH ttOrderLine of ttOrder:
// Do something
END.


The error I get now when using the last method is Index field of table1 must be fields in table2.

Could someone tell me how I can get this done?

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