RE: Supported CRM 2013 builds for importing a CRM 2011 Organisational database
Just FYI:
In a recent upgrade from CRM 2011 to CRM 2015, I initially tried to import a CRM 2011 (CU14) database into CRM 2013 with SP1, when that failed to complete successfully, I tried importing into CRM 2013 SP1 (with Update1) this also failed.
In the end I had to use the following upgrade path. CRM 2011 (CU14) --> CRM 2013 RTM --> CRM 2013 SP1 --> CRM 2015
this was a little disappointing since the official guide recommends bringing CRM 2011 database directly into a CRM 2013 SP1 deployment during the migration to CRM 2015.
https://technet.microsoft.com/en-us/library/hh699673.aspx
Anyway if anyone else is having issues, try upgrading to CRM 2013 RTM first, then applying 2013 SP1.