In R1 the vCPE custom workflow uses nf_role and nf_type to identify allotted resources: 

• For BRG, both values are 'BRG'
• For TunnelXConn, both values are 'TunnelXConn' (no space)

In R2 the workflow seems to use map different fields to its DB, causing failure of instantiation. Please revert to the R1 option.