If you want to keep track of all the changes on teh contract line items, select the Audit Trail Enabled toggle on the sub Contract revision, alone with the Contract Change Order Required and/or Change Comment Required toggles. If the Audit Trail Enabled toggle is not selected, the line items of the revisions in Planned status will be deleted from the system. If the revision status is not in Planned while the toggle is not selected, then deleted line items will not be removed from the system. They will be moved to the Deleted Section.
If Application for Payment is used, and if a valuation with the item to be deleted exists, a message is displayed where you are recommended not to delete line items that are already valued for. Further, if a valuation is created (and not cancelled) with this item, and this valuation is certified, it will not be possible to delete the sub contract line item. Likewise, if the item to be deleted exists in a call off and has a call off value, it will not be possible to delete the line item.