Check Table data in Maintenance View event

Dear all, i created a maintenance view for a customer table and a must carry out a validation over the whole table when any record is created, modified or deleted.
The table has a column with percentages and after save a modification I have to verify that the values in this columns make 1 (100%).
For this, I created a routine in the event 01 (Before Saving the Data in the Database ) of the maintenance view, but I can find the way to read all the records of the table.
I tried with the tables TOTAL and EXTRACT, but these have '#####' as values in the percentages column.
If someone need further information please let me know.
I´d be grateful if someone lead me to a solution.
Thanks in advance.
Mariano.

Hi, thx Madan Kochana .
I prefer do not modify the screen.
The column is defined as dec 3,2 and is filled with values like 0.25 or 0.10 in the view.
Thanks for your help; i'll appreciate any kind of solution.
Mariano.

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http://postimage.org/image/6701iidlh/
When i click Relationships after selecting one base table , i get the second link as u see below
http://postimage.org/image/p7wpknnht/
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HI ,
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Sunil,
check these threads
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https://forums.sdn.sap.com/click.jspa?searchID=18906946&messageID=6088233
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Thanx Rich,
but the documentation on maintenance views says that we can have read access to them. Does that mean the data can only be seen via the DDIC and not from a select written in a program??
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Maintenance Status
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you surely have earned some points here....just let me be clear of the concept behind this
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Check Table data in Maintenance View event

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