Autonumbering for EPMDocument, wind 10

I need to customize the OOB autonumbering to have a constant and an attribute driven value, so far i have created the attribute as string and mapped it to CAD Document, created an OIR with the following syntax:

<attrvalue id="number" algorithm="com.ptc.windchill.enterprise.revisionControlled.server.impl.NumberGenerator">

<arg>{GEN:wt.enterprise.SequenceGenerator:EPM_seq:10:0}</arg>

<arg>-001-</arg>

<attr id="partnumber"/">

</attrvalue>

"partnumber" being the Logical identifier for the Attribute "Part_Number" I created the parameter in Pro-E PART_NUMBER as a string, I anticipate the number should be (autonumber-001-PART_NUMBER value), I am getting nothing, am i missing something here.

Thanks in Advance