XSLT 1.0 - exclude specific descending nodes based on conditions - select

Question

Here is needed to match all nodes but NOT ( ( first TITLE among descendants ) AND
(first TITLE who is ( descendant of a GR.SEQ[#level=1] AND its inside text() DO NOT starts-with 'PART') ) )
Many thanks in advance :-)
This is my current attempt: it catches the first descendant TITLE but not the second condition described.
<xsl:template match="ANNEX|CONS.ANNEX">
. . .
<!-- this variable select the needed node to be escluded but the some instruction doesn't work on the apply-templates statement -->
<xsl:variable name="title_2" select="(.//GR.SEQ[#LEVEL=1]/TITLE[ not(starts-with(normalize-space(.), 'PART'))])[1]" />
. . .
<xsl:apply-templates select="*[ not(
( local-name() = 'TITLE' and ancestor::GR.SEQ[#LEVEL=1] and not( starts-with(normalize-space (.) ,'PART')) ) [1]
or
(local-name() = 'TITLE' )[1]
)]" />
</xsl:template>
This is the XML source:
<CONS.ANNEX>
<TITLE>
<TI>
<P>ANNEX 5</P>
</TI>
</TITLE>
<CONTENTS>
<GR.SEQ LEVEL="1">
<TITLE>
<TI>
<P>
<HT TYPE="BOLD">QUALIFICATION OF PERSONNEL</HT>
</P>
</TI>
<STI>
<P>
<HT TYPE="BOLD">[PART-XX]</HT>
</P>
</STI>
</TITLE>
<GR.SEQ LEVEL="2">
<TITLE>
<TI>
<P>SUBPART GEN</P>
</TI>
<STI>
<P>
<HT TYPE="BOLD">
<HT TYPE="ITALIC">GENERAL REQUIREMENTS</HT>
</HT>
</P>
</STI>
</GR.SEQ>
. . .
. . .
</GR.SEQ> <!-- #LEVEL="1" -->
</CONTENTS>
</CONS.ANNEX>
This is what I am trying to achieve:
<CONS.ANNEX>
<CONTENTS>
<GR.SEQ LEVEL="1">
<GR.SEQ LEVEL="2">
<TITLE>
<TI>
<P>SUBPART APT</P>
</TI>
<STI>
<P>
<HT TYPE="BOLD">
<HT TYPE="ITALIC">GENERAL REQUIREMENTS</HT>
</HT>
</P>
</STI>
</GR.SEQ> <!-- #LEVEL="2" -->
. . .
. . .
</GR.SEQ> <!-- #LEVEL="1" -->
</CONTENTS>
</CONS.ANNEX>