Item Selection on a dynamic LOV (SQL Query)

Hi,
I've a dynamic LOV with an SQL query who return a list of data (one column). When i select a data in this LOV to be use as an item (sql query) in the same page the data is always null. In debug mode substitution string is null.
FYI : when the data is selected, a button is clik to perform an sql query for a report in another page.
Thanks. Sorry Abasolute beginner
Message was edited by:
user581765

Thanks for Your help.
The date is in fact a CHAR display (not really a date) so that is not the error.
For your information when i select a row in the list (format char YYYYMMDD_HHMM) it seems that Apex do not catch my select in the Session state.
I've change the item name with P2_DATE_FLOW but the problem remain.
This is the debug log if can help
0.03: Application 114, Authentication: CUSTOM2, Page Template: 3644802034190382
0.06: ...Session ID 1868105032215374 can be used
0.06: ...Application session: 1868105032215374, user=Neop
0.06: ...Determine if user "Neop" workspace "2859608277950243" can develop application "114" in workspace "2859608277950243"
0.06: Session: Fetch session header information
0.06: ...Metadata: Fetch page attributes for application 114, page 3
0.06: Fetch session state from database
0.06: Branch point: BEFORE_HEADER
0.06: Fetch application meta data
0.08: Computation point: BEFORE_HEADER
0.08: Processing point: BEFORE_HEADER
0.08: Show page template header
0.08: Computation point: AFTER_HEADER
0.08: Processing point: AFTER_HEADER
0.08: Computation point: BEFORE_BOX_BODY
0.08: Processing point: BEFORE_BOX_BODY
0.08: Region: Report 1
Report 1
0.08: show report
0.09: determine column headings
0.09: parse query as: CFM_MDRE
0.12: binding: ":P2_DATE_FLOW"="P2_DATE_FLOW" value="0"
0.14: print column headings
0.14: rows loop: 15 row(s)
No data found.

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from
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Item Selection on a dynamic LOV (SQL Query)

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