How to pass parameters to sub-cells parameter in pcell?

Hi everyone,

Based on Andrew's bussetp.il script, (the script is in this link: https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000nX1lEAE&pageName=ArticleContent.)

I want to add two cell "vdc" from analogLib into pcell "bussetp", and assign parameter "vhi" and "vlo" as the value of vdc. And I want "vhi" and "vlo" to be  type "string", so that I can assign either number or variable as its value in simulation. I insert below script in the schematic section. With the new script, pcell is created successfully, but whenever I assign a variable, like "vhigh", to parameter "vhi", there is a warning in CIW 

*WARNING* (DB-270000): dbReplaceInstParamList: Datatype for input parameter 'vhi' does not match the definition.

Moreover, if "vhi" and "vlo" value is a string, I have to place the symbol in the schematic first, and then fill in the string in CDF window. Otherwise, all parameters' value remain as default value regardless my edit.

It looks that I did not define "vhi" and "vlo" in a correct way. I would like to know how to define them and assign value to them correctly. Or any other reason to the warning and weird issue in schematic edit.

Regards,

Yutao 

Below is script for inserting cell vdc and assign its value in pcell "bussetp".
;----------------------------------------------------------------
;Create vdc instances for hi and lo
;----------------------------------------------------------------
vhiInst = dbCreateInst(cv vdcMaster "VHI_SRC" -1:0 "R0")
vloInst = dbCreateInst(cv vdcMaster "VLO_SRC" -1:-0.5 "R0")
;----------------------------------------------------------------
; Set DC voltage parameters
;----------------------------------------------------------------
vhiInst->vdc = sprintf(nil "pPar(\"vcvs_hi\")")
vloInst->vdc = sprintf(nil "pPar(\"vcvs_lo\")")
;----------------------------------------------------------------
;Connect Nets to vdc
;----------------------------------------------------------------
dbCreateConnByName(netH vhiInst "PLUS")
dbCreateConnByName(gnd vhiInst "MINUS")
dbCreateConnByName(netL vloInst "PLUS")
dbCreateConnByName(gnd vloInst "MINUS")