Thans Mudassar.
I tried it but still it does not work for me. Please find the below piece of code and let me know if i missed anything.
<membership defaultProvider="UpmProvider">
<providers>
<add name="UpmProvider" type="Microsoft.CommerceServer.Runtime.Profiles.UpmMembershipProvider" profileDefinitionName="UserObject"
requiresQuestionAndAnswer="false" maxInvalidPasswordAttempts="5" passwordAttemptWindow="10" passwordLockoutPeriod="0" requiresApproval="false"
enablePasswordReset="true" writeExceptionsToEvenLog="true" logonNameProperty="Custom.ABONumber"
enablePasswordRetrieval="true" minRequiredNonalphanumericCharacters="2" minRequiredPasswordLength="10"
passwordStrengthRegularExpression=""/>
</providers>
</membership>