Exit MGA00001 Include ZXMG0U02

Hi gurus,

how can i update MARC table inside the exit ZXMG0U02, i'm using - Update set field = value where 'value'

Then i put commit work, but it doesnt work anyway.

the idea is to enhance TR: MM02.

Can u help me ? is there any BAPI to modify MARC table ? If so do u have a sample code to modify field MMSTA in MARC table ?

best Regards,

Mário.