FitTextBox doesnt work

I have some PDF templates that look like contracts. They're PDFs with empty form fields.

I'm removing the form fields and replacing them by using DrawTextBox instead (because FlattenFormField function is messy).

On some paragraphs , there's a field supplied for the client name and for this kind of field, FitTextBox would be better than using DrawTextBox.

Except that it doesnt work

Guess there's some detail that I dont know.

I have made a script to reproduce the problem :

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OPTION EXPLICIT

DIM objQPDF,lni,lnt
DIM X,Y,W,H,A,S

Set objQPDF = WScript.CreateObject("ISED.QUICKPDF")

objQPDF.unlockkey("yourkey")

objQPDF.NewDocument()
objQPDF.DocumentCount()

objQPDF.LoadFromFile("TEST035.PDF")

' GET TEST035.PDF from http://www.DES.online.unimep.br/au/pub/TEST035.pdf

lni=1

X=objQPDF.GetFormFieldBound(lni,0)
Y=objQPDF.GetFormFieldBound(lni,1)
W=objQPDF.GetFormFieldBound(lni,2)
H=objQPDF.GetFormFieldBound(lni,3)
A=objQPDF.GetFormFieldAlignment(lni)
S=objQPDF.GetFormFieldTextSize(lni)

lnt=objQPDF.FORMFIELDCOUNT()
for lni=lnt to 1 step -1
  objQPDF.DeleteFormField(lni)
next

objQPDF.SetTextAlign(A)
objQPDF.SetTextSize(S)

CALL objQPDF.FITTEXTBOX(X,Y,W,H,"JOSE ADRIANO BALTIERI",2)

objQPDF.SaveToFile("TEST035.PDF")

WScript.Echo "OK !"

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I'd expect to have "JOSE ADRIANO BALTIERI" scattered but it appears at the right, pretty much like as if I had used the DrawTextBox function.

What it would be wrong ?