COLS.CLS_RULE is the only thing that marks a column read-only in the grid,
and the client applies it only when CLS_FLAG is set - which column level
security drives. A table with no CLS rules therefore rendered its derived
columns as ordinary editable cells, although the values are computed at read
time and dropped from the submission.
getdata now unions a READONLY dq rule per derived variable, which the client
honours unconditionally, and the mock emits the same rule. The SAS test
asserts the rule; the cypress spec double-clicks a derived cell and asserts the
value is unchanged.
dc
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