SAP Business Partner address-independent communication

Dear Experts,
I privation to find retired the mailaddress from the address-independent connection successful SAP Business Partner.
I already know, that the mailaddress tin beryllium recovered successful array ADR6 unneurotic with a addressnumber.
But I didn't find a table, wherever those addressnumber is assigned to the nummber of the concern partner.
In BUT020 oregon BUT021_FS determination are nary entrys for it.
Could you delight archer me, successful which array the address-independent addressnumber is assigned to the nummber of the concern partner?
Regards
Gunnar Schenk