regarding bd12 standalone program

hi to all Iam using standard idoc debmas 01 to trnasfer the customer master data between

the clients 500 and 550 in between to servers .

i have done all configuration settings .

in distbution model i have made only one entry . when i execute the program bd12

in the selection sceren i have given

customerno 101 to 120 . and i execute the program then it dispalys message as

1 master idoc setup for mess type debmas

and 20 communication idocs created . that means one idoc is generated for each customer .

now my question is instead of that can we send all theese 20 customers through only one idoc ?

how can we do this ?