Shift the financial unpivot CM by n quarters.
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fiscal pit value
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202001 2020-04-15 a
202002 2020-07-15 b
202003 2020-10-15 c
202003 2020-11-15 d
202003 2021-02-15 e
202004 2021-01-15 f
202102 2022-07-15 g
202103 2022-10-15 h
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shift 1 quarter
↓
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fiscal pit value
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202002 2020-07-15 a
202003 2020-10-15 b
202004 2021-01-15 d
202004 2021-02-15 e
202103 2022-10-15 g
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Note
On '2021-01-15' previous quarter value was 'd'(The value on 202003; 2020-11-15) Then when '2021-02-15' previous quarter value becomes 'e'
Because there is no 202101 pit and value, value 'f' is dropped.