Setting the build-level in Websphere Application Server (WAS)

In the MANIFEST.MF file in the ear, you will need to set the follwing property

Implementation-Version: 4.23.0.1

In ANT you can use this

<manifest file="MANIFEST.MF">
<attribute name="Implementation-Version" value="${version} ${TODAY}"/>
</manifest>

If you use Hudson/Jenkins, then you can place the build version from Hudson/Jenkins with this

<manifest file="MANIFEST.MF">
<attribute name="Implementation-Version" value="${BUILD_NUMBER}"/>
</manifest>