Oracle Sequence in CDT

Hi,

There is a CDT which is calling a Sequence in Oracle as a primary key. Below is the extract from CDT.

<xsd:element name="recordId" nillable="true" type="xsd:int">
<xsd:annotation>
<xsd:appinfo source="appian.jpa">@Column(name="RECORD_ID") @Id @GeneratedValue @SequenceGenerator(name="sequence", sequenceName="A_RECORD_ID", allocationSize=1)</xsd:appinfo>
</xsd:annotation>
</xsd:element>

For some reason, when we are trying to insert data in the table some other sequence is being called and we are getting "Unique key Violation". We are able to identify that sequence but not able to figure how this is happening. We could not find any trigger in the table.

Any pointers would be highly appreciated.