How to respond to an invalid Security Status Request message?

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Imported from previous forum

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[ original email was from Gerard Putter - Gerard.Putter@fincomplus.com ]
The FIX 4.3 specifications are not very clear on how to react to an invalid Security Status Request. For example, suppose someone sends such a message with SubscriptionRequestType = “2” (Unsubscribe), but specifies an unknown SecurityStatusReqID. According to the table on page 38 of volume 1 (FIX 4.3) this should be reported by replying with a Security Status message. However, I cannot find an appropriate tag in that message to indicate an error condition. Anyone has a solution for this? Should I use the Business Message Reject instead?

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[ original email was from Dean Kauffman - dean.kauffman@tradeweb.com ]
Gerard,
You are correct - the appropriate response to an invalid Security Status Request is Security Status returning the requestor’s SecurityStatusReqID (324) and specifying SecurityTradingStatus (326) = 20 “Unknown or Invalid”.
Dean Kauffman

> The FIX 4.3 specifications are not very clear on how to react to an invalid Security Status Request. For example, suppose someone sends such a message with SubscriptionRequestType = “2” (Unsubscribe), but specifies an unknown SecurityStatusReqID. According to the table on page 38 of volume 1 (FIX 4.3) this should be reported by replying with a Security Status message. However, I cannot find an appropriate tag in that message to indicate an error condition. Anyone has a solution for this? Should I use the Business Message Reject instead?
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