Hello Vitaly,
Thanks for pointing to the problem of reclassification! I tried to do it and got the message TPM_CAL004. I just began to customize amortization some time ago, so I didn’t explore the related obstacles.
Tried to search the notes. There are several newest ones on this message. Hope this one can help 1755657 (I didn’t understand the text, but the transaction code TPM15M in the description leaves the hope 
)