I think you'll need to test for a work-around for this, or put in a user procedure change. From a configuration stand-point, you could try adjusting the Rescheduling Period for this Item and see if that helps (though I suppose it won't) or alter your Item card planning/replenishment parameters to try a more flexible method if you need to make changes to Sales Orders after they have been released. Sales Orders tend to become rigid once there are reservation links tied to supply orders.
Try testing a couple of the following:
*After you cancel the reservation, does NAV remove the values in the Supply Order Type and Supply Order No fields on the Sales Order line? If so, will it let you manually add the same former values into those fields before re-releasing (although this depends on what kinds of changes you were making to the Sales Order - does it really need a different/changed Production Order)?
**Are you able to alter the status of the corresponding Production Order prior to attempting to re-open/re-release the Sales Order? Were any materials already consumed at the release of the Production Order, such as in forward consumption reporting?
***If you can't find a work-around and you must alter the Sales Order, then perhaps the best thing to do is to cancel the Production Order prior-to, or along with, re-opening the Sales Order and cancelling the reservations. Perhaps test and find out which order is best to do this in, and then follow the same procedure each time.
Please let us know what you discover.
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