Issues with multiple FunctionalMockupUnitImport:To:Variables for same FMU.

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I'm receiving the following errors when trying to perform co-simulation having more than one ExternalInterface:FunctionalMockupUnitImport:To:Variable for the same FMU in EP version 9.0.1.

 ** Severe  ** GetRuntimeLanguageUserInput: ExternalInterface:FunctionalMockupUnitImport:To:Variable, invalid entry.  
 **   ~~~   ** Invalid FMU File Name=ContamFMU.fmu  
 **   ~~~   ** Name conflicts with an existing global variable name  
 ** Severe  ** GetRuntimeLanguageUserInput: ExternalInterface:FunctionalMockupUnitImport:To:Variable, invalid entry.  
 **   ~~~   ** Invalid FMU Instance Name=ContamFMU  
 **   ~~~   ** Name conflicts with an existing global variable name  
 **  Fatal  ** Errors found in getting EMS Runtime Language input. Preceding condition causes termination.

It works fine in EP version 8.3 when I also include the variables as EMS:GlobalVariables.
Using only one variable works in 9.0. However, I must remove the EMS:GlobalVariables (I think EP 8.6+ automatically creates the globals from the EI:FMUI:To:Variable declarations).

 ExternalInterface:FunctionalMockupUnitImport:To:Variable,
   CX_IN_C_TV,              !- Name  
   ContamFMU.fmu,           !- FMU File Name  
   ContamFMU,               !- FMU Instance Name  
   CTRL_O_CtrlOut_C,        !- FMU Variable Name  
   0;                       !- Initial Value

 ExternalInterface:FunctionalMockupUnitImport:To:Variable,
   CX_IN_B_TV,              !- Name  
   ContamFMU.fmu,           !- FMU File Name  
   ContamFMU,               !- FMU Instance Name  
   CTRL_O_CtrlOut_B,        !- FMU Variable Name  
   0;                       !- Initial Value

Is this a bug, or am I missing something?
I can provide a fairly simple set of co-simulation input files if necessary.

- Stuart