change email adresses in position in srm 5.5

When a user is created through users_gen then the email address is registered twice, once in su01 data and once in the position.

now we have a company wide change in the structure of email addresses so everything has to be changed.

in srm I can only find how to change the SU01 data.

with BBP_OM_USR_CREATE_EMPLOYEE_EXT all data is created

with BBP_OM_USR_UPDATE_USER_DATA is seems I can change the email but only the email address in su01 is changed and not in the position.

is there any way in changing the email address in the position also ?

kind regards

Arthur de Smidt