XPRAS_AIMMRG running without activity

Dear gurus,

We are upgrading our PRD system from R/3 4.7 to ERP 6.0 EhP6 (NW731). Our platform is Windows 2008R2 64 bits and Oracle 11.2.0.3.

We are using Resource miminized strategy. In Dev environment, the upgrade ran correctly.

We are running phase XPRAS_AIMMRG. Job RDDEXECL is active, sm50 process is running into table SCPRSREVERTOWNRI since 1 hour. No dumps, no SUM logs updates, no SAP logs updates, 0% CPU.

Regards