NAV 2015. Data Upgrade Dimension problem.

Following the guide to upgrade from NAV 2009 R2 to NAV 2015: http://blogs.msdn.com/b/nav/archive/2015/02/23/upgrading-from-microsoft-dynamics-nav-2009-r2-or-microsoft-dynamics-nav-2009-sp1-to-microsoft-dynamics-nav-2015.aspx

I'm in step 26 "Run the data upgrade process from the Tools menu by selecting Data Upgrade, and then Start"

I get this error:

"The dimension table 355 and parent table 204 do not have matching keys."

I've debugged the process, and this is the execution tree:

Tipo objeto Id. objeto Nombre objeto Nombre de función Nº línea
Codeunit 104049 UpgradeDimensionEntry UpdateParentTable 82
Codeunit 104049 UpgradeDimensionEntry UpgradeTableDim 20
Codeunit 104049 UpgradeDimensionEntry UpgradeTable 12
Codeunit 104052 UPGDIM6080.ES UpdateDimensionTables 1
Codeunit 104055 UPG6080.StartUpgrade StartUpgrade 2

So when UpgradeTableDim does UpgradeDimEntry.UpgradeTable(DATABASE::"Ledger Entry Dimension",0)

I reach UpgradeDimensionEntry.UpdateParentTable(DimTableID : Integer;ParentTableID : Integer;DestDimFieldName : Text) DimTableID is 355, ParentTableID is 0 and DestDimFieldName is 'Dimension Set ID'

Now because ParentTableID is 0, the code uses some SQL command to get ParentID, and for some unknown reason, it finds ParentID = 204.

Any ideas on why it's finding table 204 which is Unit of Measure table, that has nothing to do with dimensions??

The SQL Query is done with SQLCommand2 := SQLCommand2.SqlCommand(TableIDReaderQry,SQLConnection2);, but TableIDReaderQry variable does not exist in the debugger.