I'm not sure it is locked table.

What I'm looking for is idea or advice how to find what the real problem is.

My data source definition is this:

<connection-factories>
  <tx-connection-factory>
    <jndi-name>PowerProDS</jndi-name>
    <xa-transaction/>
    <track-connection-by-tx/>
    <rar-name>jaybird-2.1.6.rar</rar-name>
    <connection-definition>javax.sql.DataSource</connection-definition>
    <config-property name="Database" type="java.lang.String">localhost/3050:powerpro</config-property>
    <user-name>sysdba</user-name>
    <password>masterkey</password>
    <config-property name="Encoding">UNICODE_FSS</config-property>
    <prepared-statement-cache-size>100</prepared-statement-cache-size>
    <min-pool-size>10</min-pool-size>
    <max-pool-size>50</max-pool-size>
      <metadata>
         <type-mapping>EuroPro</type-mapping>
      </metadata>
  </tx-connection-factory>
</connection-factories>