APAR Fix installation fails during PrereqChecking

In the Fix Pack installation logs, you see the following error:
Install, com.ibm.ws.install.ismp.actions.PrereqCheckingAction, msg1,
Prerequisite checking has failed. Click Back to select a different package, or Click Cancel to exit.

Failure messages are:

Unable to find IBM WebSphere Commerce at a version that is equal to 7.0.0.6.

Unable to find IBM WebSphere Commerce at a version that is equal to 7.0.0.6.

Unable to find IBM WebSphere Commerce at a version that is equal to 7.0.0.6.

The wrong COMMERCE.product file is used under
WC_installdir/instance_name/properties/version/COMMERCE.product
WC_profiledir/installedApps/cell_name/WCServer_enterprise_archive/properties/ver
sion/COMMERCE.product

Toolkit instructions:
If you are installing the WebSphere Commerce Developer APAR Fix in the toolkit
environment, find the information in <id> tags in the COMMERCE.product file.
This is what the information should look like:
<id>wc.toolkit.be</id>
The following example shows where it might appear in the file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE product PUBLIC "productId" "dtd/product.dtd">
<product name="IBM WebSphere Commerce">
<id>wc.toolkit.be</id>
<version>7.0.0.0</version>
<build-info date="19/10/09" level="091013edev"/>
</product>

If the information in the <id> tags says something else, change it to
<id>wc.toolkit.be</id>.
After you fix the
WC_installdir/instance_name/properties/version/COMMERCE.product deploy the
COMMERCE.product file from the Commerce installation directory into the EAR,
to replace the corrupt file. Once you have that file updated, then you should
retry the installation and it should pass the pre-req check error.

- - - -

Runtime instructions:
If you are installing the WebSphere Commerce APAR Fix in the runtime
environment, find the information in <id> tags in the COMMERCE.product file.
This is what the information should look like:
<id>wc.server.be</id>
The following example shows where it might appear in the file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE product PUBLIC "productId" "dtd/product.dtd">
<product name="IBM WebSphere Commerce">
<id>wc.server.be</id>
<version>7.0.0.0</version>
<build-info date="19/10/09" level="091013edev"/>
</product>

If the information in the <id> tags says something else, change it to
<id>wc.server.be</id>.
After you fix the
WC_installdir/instance_name/properties/version/COMMERCE.product deploy the
COMMERCE.product file from the Commerce installation directory into the EAR,
to replace the corrupt file. Once you have that file updated, then you should
retry the installation and it should pass the pre-req check error.