Form disabled textarea

I have created a form on a page and I have added some javascript to the page.
This script will change all the textareas from a row, where column x contains Yes, to disabled(user will in this case not be able to make changes for this record).
The script will do: document.getElementById(record1).disabled = true;
When I click on my submit button I always receive the error:
Error in mru internal routine: ORA-20001: Error in MRU: row= 1, ORA-01403: no data found, update "IT_KPI"."KPI_VALUE" set "ID" = :b1
Does anybody knows how to solve this or has an other way to get the same functionality?

I believe that in my form the arrays are stored in 'f0x'
I have picked some html code from one column to make it clear:
<tr><td headers="Measurement">Expenses X</td>
<td headers="DATA_TYPE_VALUE">
<label for="f02_0001" class="hideMe508">DATA_TYPE_VALUE</label>
<input type="TEXT" name="f02" size="15" maxlength="2000" value="10" id="f02_0001" /></td>
<td headers="LOCKED">
<label for="f03_0001" class="hideMe508">LOCKED</label>
<input type="TEXT" name="f03" size="15" maxlength="2000" value="Y" id="f03_0001" /></td>
<td headers="Period">Jan 2005
<input type="hidden" name="f01" value="42" />
<input type="HIDDEN" name="fcs" VALUE="0BA996D5E38FA131153D4945B0B7BAA0"></td>
</tr>
So when I run my JS the textarea of f02_0001 will be disabled,
the user will still see the textarea but he will not be able to make changes in this textarea.
I am not that kind of expert, but if the item f02_0001 is displayed, why should it not be present in the array?
And what is the trick to send the item anyway?

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