why can I not see linecard serial number in OneClick

Document ID : KB000120924
Last Modified Date : 13/11/2018
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Introduction:
We are polling devices to pull values associated with OID 1.3.6.1.2.1.47 Physical table 1.1.1 
this should be the Linecards' Serial Numbers of these devices. 
But we cannot see the value OC.  Why?
Question:
Why can we not see the attribute value OneClick?
Answer:
If we look at this oid in mib tools, there is no value associated with it, so Spectrum has nothing to populate.
If this oid should be published, it will need to be discussed with the vendor to find out they do not publish it in the mib.
A third party mib walker tool such as Sapwalk can be used to verify if this oid is populated, before approaching the vendor, if necessary.

mib tools