Steps to reproduce:

1. Create a calculated item with a function as pattern and without ", like:

count(//item.one[1658],#4,"gt",avg(//item2[1234],15m))

Result:

With Test there will be successfully a retrieval of values possible.

During Add/Update the UI prints the following error:

Invalid parameter "/1/params": incorrect expression starting from "count(//item1[1658],#4,"gt",avg(//item2[1234],15m))".

Create/Update of items is only possible when the function (pattern) is in quotation marks:

count(//item1[1658],#4,"gt","avg(//item2[1234],15m)").

But this will end up in the error in the UI:

Cannot evaluate function: "avg(//item2[1234],15m)" is not a valid numeric float value at "count(//item1[1658],#4,"gt","avg(//item2[1234],15m)")".

Expected:

The ui follows the technical implementation and allows a pattern to be a function without quotation marks.