By products in subcontracting

When I make GR wrt subcontracting PO, I am getting movement type for by product/scrap would be 543 itself. Below mentioned link reads it as 544. Which is correct?

http://help.sap.com/saphelp_47x200/helpdata/en/4d/4b9036dfe4b703e10000009b38f889/frameset.htmhttp://help.sap.com/saphelp_47x200/helpdata/en/4d/4b9036dfe4b703e10000009b38f889/frameset.htm">http://help.sap.com/saphelp_47x200/helpdata/en/4d/4b9036dfe4b703e10000009b38f889/frameset.htm>

If it is 543, how do we differentiate between by product and child component?

Regards

Ravi