Error with variables

Hi exeperts. The SAP does not accept, use variables in their addresses? For example:

In the line :

session.findById("wnd[0]/usr/sub:SAPMM07R:0521/chkRESB-XLOEK[i-1,83]").Selected = True

Thank's

for i=1 to 15
If Cells(x, 4) = i Then
session.findById("wnd[0]/usr/sub:SAPMM07R:0521/chkRESB-XLOEK[i-1,83]").Selected = True
session.findById("wnd[0]/tbar[0]/btn[11]").press
Cells(x, 3) = session.findById("wnd[0]/sbar").Text
End If
Next

rue