To enable pipe spec validation with Smart Reference Data, you need to run the following gacutil.exe commands:
gacutil.exe /I "<Oracle file path>\product\xx.x.x\client_1\ODP.NET\bin\2.x\Oracle.DataAccess.dll"
gacutil.exe /I "<Oracle file path>\product\xx.x.x\client_1\ODP.NET\PublisherPolicy\2.x\Policy.2.112.Oracle.DataAccess.dll"
The gacutil.exe command comes with the Windows 10 SDK (https://developer.microsoft.com/windows/downloads/windows-10-sdk). If the file is available, it is not necessary to install the SDK; just copy gacutil.exe and gacutil.exe.config and that will allow you to install the dlls into the GAC.