Hello Colleagues,
we had exactly the same problem during EhP 7 upgrade on SAP ECC 6.0. (SUM v1.0 SP14 PL6)
We did the following to solve the problem:
1. unlock the shadow system with <sid>adm user on OS level:
cd /<update directory>/abap/bin
SAPup unlockshd
2. regarding the SAP Note 2086899, create the report ZRUTDDLSACT_2086899 in the shadow instance client 000 different user than DDIC
3. run the report ZRUTDDLSACT_2086899 for the objects PPH*
4. lock the shadow instance (SAPup lockshd)
5. Repeat the phase MAIN_SHDRUN/RUN_RSPTBFIL_INISHD to continue at the point it stopped
BR,
Andras