FormNumPad not showing current value

When using "FormNumPad" for operator input in its "clean" form it shows current value:

I need to limit possible input range and found this code, but it does't show current value as shown in picture below. Any suggestions?

FUNCTION CheckRealValueNumPad(STRING sTitle, STRING sTag, INT iMode, REAL rMin, REAL rMax)


REAL ReturnNumPad;
INT ReturnMessage;
STRING srMin = rMin
STRING srMax = rMax
STRING sUnit = TagInfoEx(sTag, 1)

//TagWrite(sTag, ReturnNumPad)
ReturnNumPad = FormNumPad(sTitle, (TagRead("sTag")), iMode)


	IF IsError <> 299 THEN

		IF (ReturnNumPad >= rMin) AND (ReturnNumPad <= rMax) THEN

			TagWrite(sTag, ReturnNumPad)

		ELSE
 			ReturnMessage = Message("Error", "Value must be between "+srMin+" and "+srMax+" "+sUnit,0)

				IF ReturnMessage=0 THEN

				CheckRealValueNumPad(sTitle, sTag, iMode)

				ELSE

				END
		END
	ELSE
	END
END

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