It must be one of those days.....

I have some chained HTML which looks at a DBAFILE controlled non-WebFocus file to control what values the user gets on their parameter page drop-down.
The issue I have is that whilst testing DBA, if I change the NAME attribute within the DBAFILE mas, the change does not come immediately into effect - although it seems , eventually, that it does work, although there seems no particular event that causes it to work.
I've played around with closing the BID, RESTRICT'ing the file but can't seem to get a consistent result.

HTML is....
<select
id="combo31_combo" class="combo31_combo" size="2"
multiple name="SEL_BRAND" elementname="listbox31"
elementtype="listbox" scaletofit="0" labelid caption="listbox" datatype="1"
addalloption="1" selectalloption="1" inchainindex="1" chainnumber="0" cacheruntimedata="0"
binddatasourcefpath="INF_BRANCH" datasource="INF_BRANCH" datafield="BRAND_ID" displayfield="BRAND_NAME"
numofrecords="-1" datafieldtype="CHAR" operation="OR">
</select>

Sample of DBA is...
USER=XYZ,ACCESS=R,RESTRICT=VALUE,NAME=SYSTEM,VALUE=BRAND_ID EQ '123',$
USER=SOMEUSER,ACCESS=R,RESTRICT=SAME,NAME=XYZ,$

BTW, anybody know what cacheruntimedata is and does?
Thanks
Stuart