# Block Transaction Group - Clearing Latched Values **URL:** \ **Category:** Ignition\ **Created:** [September 10, 2020, 10:18pm UTC](https://forum.inductiveautomation.com/t/block-transaction-group-clearing-latched-values/38580 "2020-09-10T22:18:28Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![andrew.harrison](https://avatars.discourse-cdn.com/v4/letter/a/85f322/32.png) [@andrew.harrison](https://forum.inductiveautomation.com/u/andrew.harrison)\ **Post date:** [September 10, 2020, 10:18pm UTC](https://forum.inductiveautomation.com/t/block-transaction-group-clearing-latched-values/38580/1 "2020-09-10T22:18:28Z")
I am experimenting with Block Groups and am trying to use Ignition to filter records from a table by passing WHERE conditions from the PLC. The selected values are then mapped back to the PLC. It seems to basically work except once a value is set in the Latched Value field, I cannot clear. it. For instance, if I trigger the group and the WHERE clause returns 6 values, the Latched and Source Values are correct. But if I then change the conditions so that only 1 value is returned and retrigger, the result is placed in position 0 but the other 5 values are retained from the previous query. I can clear the Source Values by writing them in the PLC before triggering the group but the latched values just come back. I found the section in the help about “Setting NULL DB Values to Default”, but whichever options I check, the group behaves the same. Any help will be greatly appreciated! ---
**Author:** ![Paullys50](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paullys50/32/3324_2.png) [@Paullys50](https://forum.inductiveautomation.com/u/Paullys50)\ **Post date:** [September 10, 2020, 10:45pm UTC](https://forum.inductiveautomation.com/t/block-transaction-group-clearing-latched-values/38580/2 "2020-09-10T22:45:01Z")
It’s a bug that I reported back in version 8.0.5, definitely an issue if the values are getting written to a PLC for any real control purposes.