Does not detected duplicate field id cpp

[kdoherty2]

SBE Tool v1.7.9

Given the following SBE schema

<sbe:message name="MsgSBESample2" id="1024" semanticType="MsgSBESample2">
 <field name="field1" id="1" type="uint16" presence="required" semanticType="int" />
 <field name="field2" id="1" type="uint16" presence="required" semanticType="int" />
 </sbe:message>

the SBETool generates two fields in two offsets (0,2) with the same field id.

static SBE_CONSTEXPR std::uint16_t field1Id() SBE_NOEXCEPT
{ return 1; }
 static SBE_CONSTEXPR std::size_t field1EncodingOffset() SBE_NOEXCEPT
 { return 0; }

 static SBE_CONSTEXPR std::uint16_t field2Id() SBE_NOEXCEPT
 { return 1; } 
static SBE_CONSTEXPR std::size_t field2EncodingOffset() SBE_NOEXCEPT
{ return 2; }