IFRS 9 FVOCI and expected losses

“An entity purchases a debt instrument for $1,000 on 1 January 20X1. The interest rate on the bond is the same as the effective rate. After accounting for interest for the year to 31 December 20X1, the carrying amount of the bond is still $1,000.
At the reporting date of 31 December 20X1, the fair value of the instrument has fallen to $950. There has not been a significant increase in credit risk since inception so expected credit losses should be measured at 12-month expected credit losses. This is deemed to amount to $30.”

here the journal entries we passs will be: Dr. OCI $20 Dr. SPL $30 and Cr. financial asset $50.

Now its pretty evident that the carrying amount of the asset fell because of the expected credit losses(SPL Dr.) and other market factors(Dr. OCI), causing our finical asset to be reflected at $950 in SFP.

still somehow my strdy text mentions that “These assets are held at fair value at the reporting date and therefore the loss allowance should not reduce the carrying amount of the asset in the statement of financial position. Instead, the allowance is recorded against other comprehensive income”