Hello Colin,
Have you checked the IDT guide in section 9.4.3 Selecting delimitation overrides to keep
http://help.sap.com/businessobject/product_guides/boexir4/en/xi4_info_design_tool_en.pdf
Which clearly explains
- To keep the delimitation value set for the previous connection, leave the check box selected.
- To remove the delimitation override and use the newly detected delimitation value, unselect the check box.
Regards,
Mani