Hi CILGroup,
Thank you for posting your question to the forums about locking Inventory Transactions on items by location/sku while Physical Inventory Journal is loading.
Is this "Stock-Take Process" you refer to part of the NAV 2016. I'm wondering if this is a country specific localization or some add-on. I read the following post so it seems this may be in the product, however I've never seen it, so I'm not really sure what that is about..
community.dynamics.com/.../stock-take-journal-count-sheets
But generally speaking, we have a field on the Item Card called 'Blocked'. You can set that, however we don't have it on the SKU (Location) which you may be looking for. I know you mentioned (No Mods), but perhaps your Partner could add that field and some similar logic on the SKU card to block certain Item SKU's from being posted during your cycle counts. But again, out of the Box NAV, doesn't have that.
One other option, which may totally be a bit far fetched perhaps, according to your setup, configuration, and business process (which I know neither of) but generally speaking, if using Bins, you could reclass that quantity into some type of Holding Bin. In the Bin Contents, you can set the 'Block Movement' to ALL. Again, it depends on your configuration, but that is some ideas you can play around with in Cronus to see if it will fit your situation. Thanks much and have a nice weekend

Bryan