# Access denied when writing from derived tag

**URL:** <https://forum.inductiveautomation.com/t/access-denied-when-writing-from-derived-tag/26215>\
**Category:** Ignition\
**Created:** [July 2, 2019, 6:02am UTC](https://forum.inductiveautomation.com/t/access-denied-when-writing-from-derived-tag/26215 "2019-07-02T06:02:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ben.Mehmet](https://avatars.discourse-cdn.com/v4/letter/b/58956e/32.png) [@Ben.Mehmet](https://forum.inductiveautomation.com/u/Ben.Mehmet)\
**Post date:** [July 2, 2019, 6:02am UTC](https://forum.inductiveautomation.com/t/access-denied-when-writing-from-derived-tag/26215/1 "2019-07-02T06:02:27Z")

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Hi,  
I have a long Int OPC tag and two separate derived tags - where one reads the first 2bytes of the long int and the other reads the last 2bytes of the long Int.  
When I have security on the long int, the derived tags are unable to write to the long int - displaying Bad\_AccessDenied in the output console.  
I can modify the long int tag directly though so i know i have access.

It feels like the derived tags do not have the authority to write to the long int. Is there anyway to change this ?

Any help would be much appreciated.  
Cheers,  
Ben