I continutally get the following message:

The Opportunity Amount field does not appear to be tracking field value changes

I've created the following Opportunity.object file and package.xml and deployed them via workbench + metadata API

Opportunity.object
<?xml version="1.0" encoding="UTF-8"?>
<CustomObject xmlns="http://soap.sforce.com/2006/04/metadata">
    <historyRetentionPolicy>
        <archiveAfterMonths>6</archiveAfterMonths>
        <archiveRetentionYears>5</archiveRetentionYears>
        <description>My field history retention</description>
    </historyRetentionPolicy>
    <fields>
        <fullName>Amount</fullName>
    </fields>
</CustomObject>

package.xml
<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>Opportunity</members>
    </types>
    <version>32.0</version>
</Package>

Any suggestions as to where I've gone wrong?

I continutally get the following message:

The Opportunity Amount field does not appear to be tracking field value changes

I've created the following Opportunity.object file and package.xml and deployed them via workbench + metadata API

Opportunity.object
<?xml version="1.0" encoding="UTF-8"?>
<CustomObject xmlns="http://soap.sforce.com/2006/04/metadata">
    <historyRetentionPolicy>
        <archiveAfterMonths>6</archiveAfterMonths>
        <archiveRetentionYears>5</archiveRetentionYears>
        <description>My field history retention</description>
    </historyRetentionPolicy>
    <fields>
        <fullName>Amount</fullName>
    </fields>
</CustomObject>

package.xml
<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>Opportunity</members>
    </types>
    <version>32.0</version>
</Package>

Any suggestions as to where I've gone wrong?