I found this out the hard way today so am passing it on to you to learn from. After patching to SP1 I had to replace a few items on a couple of my layouts with different ones because the old items from another author were now faulty and the author had said he was not going to update them so I decided to replace them.
Unfortunately I got much more then I bargained for in this process. No good deed, in this case trying to make these layouts fault free, goes unpunished. It turns out that SP1 updated a LOT of built-in content. When I loaded my layout into the Surveyor the KUIDs without my realizing it, were updated as well to these new SP1 ones.
When I saved the layout I noticed the build number had been changed from 3.6 to 3.7 which I did not want or suspected I needed (hah!). I manually changed this back to 3.6 and uploaded it to the DLS. Guess what happened next!
A user who attempted to use one of the layouts in a pure TRS2012 (unpatched with SP1) reported 361 missing items which were not found on the DLS. These items came without my knowing about it with SP1.
As a result of this mess I have had to create a new version of both layouts today which changed the build number back to 3.7 and upload them again to the DLS to straighten out this confusion for all my users.
Bottom line: Layouts which are loaded into a SP1 surveyor and then saved will most likely NOT be compatible with an unpatched version of TRS2012 and must be left as build 3.7.
Unfortunately I got much more then I bargained for in this process. No good deed, in this case trying to make these layouts fault free, goes unpunished. It turns out that SP1 updated a LOT of built-in content. When I loaded my layout into the Surveyor the KUIDs without my realizing it, were updated as well to these new SP1 ones.
When I saved the layout I noticed the build number had been changed from 3.6 to 3.7 which I did not want or suspected I needed (hah!). I manually changed this back to 3.6 and uploaded it to the DLS. Guess what happened next!
A user who attempted to use one of the layouts in a pure TRS2012 (unpatched with SP1) reported 361 missing items which were not found on the DLS. These items came without my knowing about it with SP1.
As a result of this mess I have had to create a new version of both layouts today which changed the build number back to 3.7 and upload them again to the DLS to straighten out this confusion for all my users.
Bottom line: Layouts which are loaded into a SP1 surveyor and then saved will most likely NOT be compatible with an unpatched version of TRS2012 and must be left as build 3.7.