Oracle float(64) column import to SQL Server error

I am using SQL Server export\import wizard to import one oracle table to SQL Server. Got an error:

then I change type to float

then I got this

double click one, then got this:

I  did add below in C:\Program Files (x86)\Microsoft SQL Server Management Studio 18\Common7\IDE\CommonExtensions\Microsoft\SSIS\150\MappingFiles\OracleToSSIS10.XML

<!-- FLOAT -->
<dtm:DataTypeMapping >
<dtm:SourceDataType>
<dtm:DataTypeName>5</dtm:DataTypeName>
</dtm:SourceDataType>
<dtm:DestinationDataType>
<dtm:CharacterStringType>
<dtm:DataTypeName>DT_FLOAT</dtm:DataTypeName>
<dtm:Length>64</dtm:Length>
</dtm:CharacterStringType>
</dtm:DestinationDataType>
</dtm:DataTypeMapping>

I did add below to C:\Program Files (x86)\Microsoft SQL Server Management Studio 18\Common7\IDE\CommonExtensions\Microsoft\SSIS\150\MappingFiles\MSSQLToSSIS10.XML

<!-- float -->
<dtm:DataTypeMapping >
<dtm:SourceDataType>
<dtm:DataTypeName>float</dtm:DataTypeName>
</dtm:SourceDataType>
<dtm:DestinationDataType>
<dtm:CharacterStringType>
<dtm:DataTypeName>DT_R8</dtm:DataTypeName>
<dtm:Length>64</dtm:Length>
</dtm:CharacterStringType>
</dtm:DestinationDataType>
</dtm:DataTypeMapping>

what can I do fix the issue?

Many thanks,

Sky