Edm.Decimal - not accepting decimal values in Gateway Calls

Hello Experts,

I have a service which looks like below :

And my gateway http call looks like below :

/sap/opu/odata/sap/ZUI5_MAIN_SRV/salesColl_saveInvoicesSet?$filter=AmountCol eq 1.00

The above call ends up in error always and the error is "Property 1.00 not found in type salesColl_saveInvoices".

But If I remove the decimal values, it is working fine.

/sap/opu/odata/sap/ZUI5_MAIN_SRV/salesColl_saveInvoicesSet?$filter=AmountCol eq 1

Where am I going wrong?

Thanks,

Seyed Ismail.