1991712 - Missing field name / Missing own schema in database during "DBCHK_INI" phase of SUM.

• During upgrade using the Software Update Manager (SUM) the DBCHK_INI phase aborts with severe errors. 
• For example the below logs will be generated under Phases.log

2 ETQ399 Found 1 other SAP schemas (excluding shadow schemas) in database.
2WETQ399 Missing own schema 'SAPR3' in database, better asking user!
4 ETQ399 Starting dialog 'MCODSystem' at 20140109112645.
1EETQ399 Last error code set is: Missing field name
1EETQ204 Upgrade phase "DBCHK_INI" aborted with severe errors
("20140109112645")

And futher refer to the logs for phase  PREP_INIT/DBCHK_INI 

3 ETQ399 Reading selections from 'CHKMCOD.OUT'.
4 ETQ399 Read 1 entries for table 'LIST'.
1 ETQ399 Found 1 SAP schema with SQL task 'CHKMCOD'.
2 ETQ399 Found SAP schema 'SAPTAC'.
2 ETQ399 Found 1 other SAP schemas (excluding shadow schemas) in database.
2WETQ399 Missing own schema 'saptac' in database, better asking user!
4 ETQ399 Starting dialog 'MCODSystem' at 20140306114904.
1EETQ399 Last error code set is: Missing field name
1EETQ204 Upgrade phase "DBCHK_INI" aborted with severe errors

SAP Netweaver Application ABAP