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In this case you need modify also the ACLs as mentioned and modify the OIR rules where is defined a constraint rule for number that could not be changed.
folowing constrain should be removed from OIR
<Value algorithm="com.ptc.core.rule.server.impl.GetImmutableConstraint"/> (this value should be removed from OIR)
example:
<AttrConstraint id="number" algorithm="com.ptc.core.rule.server.impl.GatherAttributeConstraints">
<Value algorithm="com.ptc.core.rule.server.impl.GetServerAssignedConstraint"/> ( this value is for autonumbering)
</AttrConstraint>
