Cost center Issue

Hi,

i am facing a issue with cost center while creating reservation in SRM. the issue is there are 4 costcenters like

1234;1235;1236 and 1237 in SRM. but when i create a reservation in SRM i need only 1237 instead of 1234.

But always 1234 has activated by default instead of 1237.

so i need only 1237 costcenter.

so can you please advise where i need to check or change the settings.

Thanks in Advance.

BR,

sss