HANA FUNCTION LOCATE WRONG POSITION RESULT

[dausto]

Hello guys,
I'm in trouble with LOCATE function returning data on HANA Database (HANA v. 2.00.059.09...).

This is the query a run:
SELECT T0.U_ALD_VARIANTI
,LOCATE(T0.U_ALD_VARIANTI,'=') AS POS
,LOCATE(T0.U_ALD_VARIANTI,'=',-1) AS POSX
,LOCATE(T0.U_ALD_VARIANTI,'=',-2) AS POSY
FROM OITM T0 WHERE t0."ItemCode"='DISCOFERRO2A$CL.1_Fg.II75DIAM60'

And the scope is to find position of the first and second char '=' in the string 'CLRIF=CL.1;CLFIG=_Fg.II75;TGSEG=DIAM60'.
The positions are 6, 17 and 32 but as you can see in the image below, for second '=' in position 17 the function doesn't return me the correct position.

I believe that may be because of the underscore ( '_' ) in the string; probably LOCATE function use a search LIKE in the string.

Please, have you any suggestion or there is another function instead of LOCATE for obtaining the same find result?

Thank you in advance!