Upgrade Microfocus projet from V2 to V6

Hi, im working to upgrade a old V2 projet to the new version of microfocus V6.

When a change the ToolsVersionattibute in the cblproj, i have some error in compilation

i change Project ToolsVersion="4.0"  to Project ToolsVersion="15.0"   (v15 is the toolsversion for VS2017)

This is the détail of the error:

Compiling C:\AGE-VSTS\vsts-agent2\_work\484\s\Lot\Util\CBL2SQL\CBL2SQL.CBL
##[error]Lot\Util\CBL2SQL\CBL2SQL.CBL(123,49): Error COBCH0860: Object references must be specified at 01 level
C:\AGE-VSTS\vsts-agent2\_work\484\s\Lot\Util\CBL2SQL\CBL2SQL.CBL(123,49): error COBCH0860: Object references must be specified at 01 level [C:\AGE-VSTS\vsts-agent2\_work\484\s\Lot\Util\CBL2SQL\CBL2SQL.cblproj]
##[error]Lot\Util\CBL2SQL\CBL2SQL.CBL(124,49): Error COBCH0860: Object references must be specified at 01 level
C:\AGE-VSTS\vsts-agent2\_work\484\s\Lot\Util\CBL2SQL\CBL2SQL.CBL(124,49): error COBCH0860: Object references must be specified at 01 level [C:\AGE-VSTS\vsts-agent2\_work\484\s\Lot\Util\CBL2SQL\CBL2SQL.cblproj]
##[error]Lot\Util\CBL2SQL\CBL2SQL.CBL(526,44): Error COBCH0029: Not a data name

Any idea ????

Regards

Eric