3002140 - Testing with Client Proxy results in: "Draft entity: Entity Set uses error tolerant conversion"

Testing with Client Proxy results in error:

Exception Error </IWBEP/CX_CP_RUNTIME>
Details
Draft entity: Entity Set uses error tolerant conversion
Test 'LTC_CREATE->CREATE' in Main Program 'ZCT_COM_DP_PROJECT============CP'.
Stack

Include: </IWBEP/CL_CP_CLIENT_PROXY=====CM011> Line: <12>
Include: </IWBEP/CL_CP_CLIENT_PROXY=====CM002> Line: <9> (/IWBEP/IF_CP_CLIENT_PROXY~CREATE_RESOURCE_FOR_ENTITY_SET)
Include: </IWBEP/CL_CP_RESOURCE=========CM003> Line: <38> (CREATE_RESOURCE_FOR_ENTITY_SET)
Include: </IWBEP/CL_CP_CLIENT_PROXY=====CM002> Line: <4> (/IWBEP/IF_CP_CLIENT_PROXY~CREATE_RESOURCE_FOR_ENTITY_SET)
Include: <Z_SOME_PROJECT============CCAU> Line: <114> (CREATE)

• SAP Gateway
• SAP Cloud Platform ABAP Environment

client proxy, adt, eclipse, testing, unit test , KBA , OPU-GW-COR , Framework , Problem