# Trading Session Status for specified securities

**URL:** <https://forum.fixtrading.org/t/trading-session-status-for-specified-securities/3752>\
**Category:** General Q&A\
**Tags:** general-qa, xid\_167045, imported\
**Created:** [September 22, 2000, 2:21pm UTC](https://forum.fixtrading.org/t/trading-session-status-for-specified-securities/3752 "2000-09-22T14:21:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![roymaclean\_x](https://avatars.discourse-cdn.com/v4/letter/r/5f9b8f/32.png) [@roymaclean\_x](https://forum.fixtrading.org/u/roymaclean_x)\
**Post date:** [September 22, 2000, 2:21pm UTC](https://forum.fixtrading.org/t/trading-session-status-for-specified-securities/3752/1 "2000-09-22T14:21:00Z")

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Imported from previous forum

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<div class="post-metadata">

**Author:** ![roymaclean\_x](https://avatars.discourse-cdn.com/v4/letter/r/5f9b8f/32.png) [@roymaclean\_x](https://forum.fixtrading.org/u/roymaclean_x)\
**Post date:** [September 22, 2000, 2:21pm UTC](https://forum.fixtrading.org/t/trading-session-status-for-specified-securities/3752/2 "2000-09-22T14:21:00Z")

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We have a market in which different securities may have different Trading Sessions. There is a default session for the market as a whole, and a number of different sessions for specified securities. The former applies to all securities not explicitly over-ridden.

The FIX spec (v4.2, page 78) says:  
"The Trading Session Status can provide an optional repeating group of securities that are available for trading during the session". However, the message table does not specify this explicitly.

Questions:

1. Is this repeating group the same as fields  
#146 NoRelatedSym  
#311 UnderlyingSymbol  
etc.  
from SecurityDefinitionRequest (this is implied by a comment on page 77)?

2. Is it valid to use a Trading Session Status message without explicit Symbols for the market default session?

My working assumption is yes to both.