Is there a minumum char length in EXPR inside <@FILTER> of 2 ?

<@FILTER ARRAY="AllParameter" EXPR="(#1 >= M0) and (#1 <= M9)" SCOPE="request">
works fine, but

<@FILTER ARRAY="AllParameter" EXPR="(#1 >= M) and (#1 <= M)" SCOPE="request">

 

returns

Error

An error occurred while processing your request:

File: Search.taf
Position: Search_All_Parameters
Class: Internal
Main Error Number: -18

Error during _expression_ evaluation.
String expected in statement [("F007AF >= M) and (F007AF <= M)]

Same result with EXPR=”#1 = M” but works with ”#1 = M0”, wildcards doesn’t work either.
Using Witango Studio 5.5.08 and
5.0.1.065 Chimera (Win32) on IIES W2K.

Appreciate any help on this.


/Bengt

 

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