How to test suffix field with the IF informed when inserting citation (UniFAE)

I need to test the suffix informed to launch the author to change the formatting of the citation.
Situation:
If I put the suffix "."
Like this: (JOE, 1990, p. 23).
If the suffix is ​​different of "." Should look like:
Joe (1990, p. 23)
I tried, but failed:

<citation et-al-min="3" et-al-use-first="1" et-al-subsequent-min="3" et-al-subsequent-use-first="1" collapse="year">
<sort>
<key macro="author"/>
<key variable="issued"/>
</sort>
<if suffix=".">
<layout delimiter="; ">
<group delimiter=" ">
<text macro="author-short"/>
<group prefix="(" suffix=")" delimiter="; ">
<text macro="issued-year"/>
<text macro="citation-locator"/>
</group>
</group>
</layout>
</if>
<else>
<layout prefix="(" suffix=")" delimiter="; ">
<group>
<text suffix=", " macro="author-short"/>
<text macro="issued-year"/>
<text prefix=", " macro="citation-locator"/>
</group>
</layout>
</else>
</citation>

Help-me please!
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