OData Date Conversion Decimal - Date

Hey,

i want to send dates via my OData-Service. Therefore i imported a ABAP-Structure.

But the dates in the ABAP-Structure are from type DEC length 15 (YYYYMMDDhhmmss).

That convertes in EDM.Decimal 15 but i get the error: '05.11.2015 23:00:00' can not converted in a number.

How can this issue be solved?