SYSTEM.MOUSE_RECORD_OFFSET
If the mouse is in a record, SYSTEM.MOUSE_RECORD_OFFSET represents the offset from the first visible record as a CHAR value. SYSTEM.MOUSE_RECORD_OFFSET is only valid within mouse triggers. Its value represents which row within the visible rows the mouse has clicked.
For example, if the mouse is in the second of five visible records in a multi-record block, SYSTEM.MOUSE_RECORD_OFFSET is 2. (SYSTEM.MOUSE_RECORD_OFFSET uses a 1-based index).
Note: SYSTEM.MOUSE_RECORD_OFFSET is 0 if the mouse is not in an item (and thus, not in a record).
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