Sieble Adapter Operator limitation ~LIKE

Siebel has a operator called as ~LIKE, which gives the flexibility to it’s cliet to search irrespective of case sensitiveness. Since webMethods siebel Adapter does not have a operator as defined in Siebel, so webMethods siebel adapter’s has a limitation on case sensitiveness search.

Can somebody verify that this is a webMEthods siebel adpater limitation or not ?
If yes, is there any alternative to this issue ?

Thanks
Sushil