TS Supply Optimizer splitting Customer Transportation across multiple source locations

Hello IBP Gurus,

We have a business requirement where in a given monthly period, the Customer Transportation should not be split across multiple source locations. I know we can use Customer Transportation Quota's, but without defining quota's for each customer transportation lane, can it be controlled through cost parameters or some other parameter?

We tried using Fixed Customer Transportation Cost Rate, but still it is doing the split.

Any inputs are highly appreciated.

Thanks,

Mangesh