BPP 296 Highveltd Co

Hi,
I’m doing the BPP kit with the excersise 295 Highveltd Co and I have a question.
In the exercise, there is the note iv:
“Samson Co (Highveltd’s subsidiary)’s development project was completed on 30 September 20X4 at a cost pf $50m. $10m of this had been amortised by 31 March 20X5 (reporting date). Development costs capitalized by Samson Co at the acquisition date (1 April 20X4) was $18m. Highveltd Co’s directors are of the opinion that Samson Co’s development costs do not meet the criteria in IAS38 for recognition as an asset.”
So regard to this note, the answer shows a reduction in RE of Samson for the amount of $32m ($50m-$18m). I wonder that why we dont deduct all the amount of $50m? Is that because $18m should be dedected in the previous year RE? And if $18m is deducted in Samson’s RE previous year then we should adjust the RE of Samson Co at acquisition date in calculating Goodwill?
Am I correct?
Thank you