Customer was using layer guard in CPL layer in SGOS version before 7.4.x.
Example of the layer
<Proxy> condition=!__is_notify_internal condition="AD Groups"
After upgrade to 7.4.x they were getting error
Condition not defined in or visible from the 'global context': '__is_notify_internal' condition=_is_notify_internal
Syntax condition=!__is_notify_internal is obsolete in the new SGOS version 7.4.x
New CPL syntax for Layer guard is as following
<Proxy> condition="AD Groups"
New CPL rules for Layer Guard can be seen Layer Guards-CPL