2613356 - "GETWA_NOT_ASSIGNED" runtime error for program /SSA/ESS in SAP ERP 6.0

Upon upgrading the ST-A/PI plugin to a newer support package within SAP ERP 6.0, a shortdump occurs with the following details when running TBI_REPORTS:

Category ABAP                Programming Error
Runtime Errors                GETWA_NOT_ASSIGNED
ABAP Program                 /SSA/ESS
Application Component     SV-SMG-MON-BPM

Short Text
     Field symbol has not been assigned yet.

Error analysis
     An attempt was made to access a field symbol that has not been assigned
     yet (data segment number "-1").

     That error occurs if
     - a typed field symbol is addressed before it has been set with ASSIGN,
     or
     - a field symbol is addressed that points to a row in an internal table
     that has been deleted, or
     - a field symbol is addressed that was previously reset using UNASSIGN,
     or that pointed to a local field that no longer exists, or
     - a parameter of a global function interface is address, although the
     corresponding function module is not active (is not in the list of
     active calls). The list of active calls can be taken from this short
     dump.

Information on where terminated
     The termination occurred in ABAP program "/SSA/ESS", in "%_SEL_SCREEN". The
     main program
     was "/SSA/ESS".

     In the source code, the termination point is in line 6797 of (Include)
     program "/SSA/ESS".

• SAP ERP 6.0
• ST-A/PI 01S

SOLMAN, BPM, BPO, BPMON, TBI_REPORTS, ST-A/PI, Line 6797, READ TABLE GT_ACT_OBJECTS ASSIGNING <ACT_OBJECTS> WITH KEY, /SSA/ESS. , KBA , SV-SMG-MON-BPM , Business Process Operations , SV-SMG-MON-BPM-MON , Monitoring , Problem