How to get sequence number in RefreshMsg and updateMsg

We use Refinitv Elektron SDK API (ema.jar, upa.jar, upaValueAdd.jar version 3.5.0.0) to connect to Refinitiv to get market data.

We are looking into to validate whether some updates from Refinitiv are getting lost/dropped or received out of order.

We tried to use field SEQNUM (FID 01021) and updateMsg.seqNum(), but these are getting incremented in not a predictable format.

What field we can use within RefreshMsg and updateMsg to get message sequence number, which we can use ?

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