Issuefunction does not work with customfield ID

Question

Funny, but can't figure it out why in query when used custom field name works (A), but when used customfield id (B) does not?

A) issuefunction in portfolioChildrenOf("project = IO and Architecture_Status = 'Approved'") and issuetype = Epic

B)  issuefunction in portfolioChildrenOf("project = IO and "customfield_15402" = 'Approved'") and issuetype = Epic

Mindaugas Kuodis · Accepted Answer

Found the answer, format should be as below:

cf[15402]