ISSUE 1: Reverse a build
If you have an assembly of 50 items, and you build the wrong assembly by accident, or, you get a return and want to put the items back into stock, there is no way to reverse an assembly build, except to enter 51 stock adjustments, One stock adjustment out (of whatever the build quantity is) and then 50 stock adjustments in (of whatever the build quantity was multiplied by the quantity needed of that item).
ISSUE 1: Reverse a build If you have an assembly of 50 items, and you build the wrong assembly by accident, or, you get a return and want to put the items back into stock, there is no way to reverse an assembly build, except to enter 51 stock adjustments, One stock adjustment out (of whatever the build quantity is) and then 50 stock adjustments in (of whatever the build quantity was multiplied by the quantity needed of that item).
WORKAROUND Here is the official CB KB article documenting this: https://my.connectedbusiness.com/index.php?rp=/knowledgebase/104/How-to-Delete-or-Remove-Build-Assembly.html
ISSUE 2: Void and unposted build There is no way to void an unposted build.