Hello Boris,
I was told by SAP Support to recover the System and then apply SAP Note 2223723 before applying the Support Packages again.
We need to to install UI add-ons for Netweaver (at least SAP UI5 SP14 and SAP UI INTEGRATION INFRASTRUCTURE SP 14) and all the available CTS_PLUG add-ons (sp 16) before installing Support Package Solution Tool SP14 (ST SP14) or you'll hit this bug again.
The above recommendations are valid only if you want to install ST SP14 in this scenario:
I did recover the system but the SAP Note above mentioned couldn't be applied with SNOTE tcode neither manually.
I was lost until one of my co-workers helped me to create an XML Stack File using the Maintenance Optimizer (MOPZ), including all the prerequisites to install the ST SP14, as the needed Support Packages and add-ons. It is mandatory as per SAP Note 1666368.
I did install that MOPZ's Stack XML file using SAINT and the installation ran this time with just minor issues like having to call SPAU, unlocking some objects and resetting some note corrections to original (usual stuff when you import Support Packages).
I didn't want to cancel/terminate the Support Pack import process and let the system in a corrupted state. That's why I opted for the system recovery. It was easy for me because I had a Solaris ZFS snapshot which helped me to recover the system in some minutes.
Sorry for the long story, it seems that there is not an easy solution for this bug. I hope that this could be helpful for you!
Miguel Vizcaino.