Which COBOL construct most often requires careful manual review after wca4z generates the equivalent Java?

Think of it like working hands-on with IBM mainframe systems — the answer here is 'Simple MOVE statements assigning literal values to alphanumeric fields'. Complex PERFORM UNTIL loops with multi-field exit conditions can result in subtle control flow differences in generated Java, requiring developers to verify that loop termination logic preserves origi. On real mainframe exams, this concept comes up repeatedly so make sure you have it locked in.