Helpppp: IAS 16 in textbook of Financial Statement

Hi, anyone knows about these (i can't get my head around these
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in p. 155 of textbook of financial statement
IAS 16 states that a revaluation gain can ONLY be recognised in profit or loss if it reverses a revaluation loss that has previously been recognised in profit or loss
(does it mean the gain of this item before has previously had a loss?? )
and in p. 167
IAS 16 under the fair value model the property (guessed they talking about investment property) is not depreciated; and the gain or loss on revaluation is recognised IN PROFIT OR LOSS not in other comprehensive income.
are they a bit contradict.....oh dear....anyone can help
Many thanks for any advice.

in p. 155 of textbook of financial statement
IAS 16 states that a revaluation gain can ONLY be recognised in profit or loss if it reverses a revaluation loss that has previously been recognised in profit or loss
(does it mean the gain of this item before has previously had a loss?? )
and in p. 167
IAS 16 under the fair value model the property (guessed they talking about investment property) is not depreciated; and the gain or loss on revaluation is recognised IN PROFIT OR LOSS not in other comprehensive income.
are they a bit contradict.....oh dear....anyone can help
Many thanks for any advice.
0
Comments
Any revaluation gains are credited to the revaluation surplus on the balance sheet. If in subsequent years, the revaluation creates a loss, in the first instance this loss is charged to the revaluation surplus, and then the remainder to P&L if the loss is greater than the surplus.
If the revaluation then creates a gain in another year, you can show this in P&L as it is reversing a loss written off in a previous period. (Limited to the amount written off in prior year)
With the fair value model, all gains and losses are reported in the P&L. (IAS 40 deals with Investment properties)
For example. if a PPE purchasing cost: 1000
Year 1 revaluation value become 1100
year 2 revaluatiion value become 700
year 3 " " 800
year 4 " " 1100
Am I right to report like the following
Year 1 Gain in Revaluation Reserve of property 100 (under the title of "Other comprehensive income for the year" in Statement of Comprehensive Income)
Year 2 Loss in Profit and Loss bit: 300 in Statement of Comprehensive income to work out "profit from Operation"
Year 3 Gain in Profit and Loss bit: 100 in statment of comprehensive income to work out "profit from operation"
Year 4 Gain in Revaluation Reserve of property 100 (like year one)
Many thanks again