Cannot use GO_ITEM, GO_BLOCK in POST-CHANGE

It is quite difficult to control the flow if I cannot use GO_ITEM, GO_BLOCK in POST-CHANGE trigger, is there alternative way?

This really is an old chestnut. In the days of character mode many people used to put such code in key-triggers, which meant large numbers of triggers, possible loopholes, and a nightmare when it came to conversion to mouse navigation.
After using various methods in the past, I have now standardised on using a FORM-LEVEL WHEN-NEW-ITEM-INSTANCE trigger in all of my new forms. Although I originally did this because I wanted to highlight the current field, I have since found it very useful for doing other things. If I want to navigate as a result of WHEN-VALIDATE-WHATEVER I set a variable to the name of the item I want to go to (could use a global but I prefer packaged variables). The W-N-I-I trigger reads the variable and does the GO-ITEM (and of course nullifies the variable).
I also agree with Steve, POST-CHANGE is oldy-fashioned and not really the right thing to use.

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