Community Summit Europe | March 9-12, 2020 | Barcelona, Spain Register today
I do not believe this is an issue, at least I'm not getting those results when I conduct this scenario in a 2018 version.
I ran a scenario below and I do see for the same location code where I see a supply and a demand line where it adds inventory via a supply, and reduced inventory via a demand without the show include planning suggestions. This was two Transfers Orders, different days, with the opposite location codes in the header.
Running MRP/MPS, you shouldn't be getting suggestions both ways due to the sku cards only having one setting. But I believe the issue you may be having is perhaps you have cancel/new or change suggestions to existing transfer orders perhaps not showing up without the include planning suggestions…since you are running planning and haven't actioned the suggestions from planning.
If you've found this thread useful, dive deeper into User Group community content by role