Error mapping instances variables from schematic to layout using SKILL

Hello 

I made an interface which accepts from the user  transistors sizes to be mapped from a design schematic to layout. After entering values for these variables, the code mappes the intances names to their correct sizes. The issue i am dealing with is that the source, drain areas of the instances are not updated inside the schematic which generates an error when mapping the design to layout.

please find the script below:

CellSchId =dbOpenCellViewByType("test" "cell" "schematic" "schematic" "a")

deOpenCellView("test" "cell" "schematic" "schematic" list(list(0 0) list(500 500)) "r")

instIDM7=dbFindAnyInstByName(CellSchId "M7" )

instIDM7~>l=l7

instIDM7~>nf="2"

instIDM7~>w=w7

instIDM7~>wf=w7*nf

instIDM8=dbFindAnyInstByName(CellSchId "M8" )

instIDM8~>l=l7

instIDM8~>nf="2"

instIDM8~>w=w7

instIDM8~>wf=w7*nf

deOpenCellView("test" "cell" "layout" "maskLayout" list(list(0 0) list(2000 2000)) "r")

CellLayId =dbOpenCellViewByType("test" "cell" "layout" "maskLayout" "a")

;######################## END INSTANCES MAPPING ####################

lxGenFromSource( 

CellSchId .........)


############################

I tried to use desvar() but this didn't help either.

Thank you

Taher