BAPI_ACC_DOCUMENT_POST giving return message Profitability segment being derived again

[Praveen_Sankaraddi]

Hello all,

(I am a junior ABAPer working on an incident.)

We have a custom code in which Function module BAPI_ACC_DOCUMENT_POST used for posting(CO related).

when ever i try to post the data, i am getting return message from FM in return table like this.

here few are Error message and few are Warning, 

1 thing i observed in the return table for multiple line item posting, Profitability segment being derived again is the common message in return table.(all items are not posting).

1)  I want clarify myself, Is the Rederivation is a common thing for all the posting ?

2) If data is correct, still it do re derivation or is there a thing like only derivation?

3) Actually why it do re derivation?

Thanks in advance for your time and effort to explain me this.

Best Regards,

Praveen