S4/HANA ATC Check: MARC has a CDS view as a proxy object

An ATC check on an ABAP program where I developed on SAP S/4HANA, I got following error: "MARC has a CDS view as a proxy object". When I clicked on the Object Name column link on the ATC results table, I could directly jump into where the problem occurs. This was an DDL SQL View object (a CDS View), where MARC table is used as one of the JOIN table of the CDS view SQL SELECT query.

ABAP ATC error: MARC has a CDS view as a proxy object

When I checked the error details, I see that it refers to SAP Note 2206980.
ABAP programmers can check the SNOTE content via SAP transaction SNOTE

According to the referred SAP Note where the new simplified data model of SAP S/4HANA Supply Chain (MM - Inventory Management) is described. MARC table is one of the database tables affected from the simplified data model and called as hybrid table afterwards.

Table: MARC
Table description: Plant Data for Material
DDL Source of CDS View for redirect: NSDM_DDL_MARC
View to read the content of the database table (w/o redirect to compatibility view): NSDM_MIG_MARC
View to read the master data attributes only: V_MARC_MD

If you are reading plant material master data, instead of reading data from MARC table, you can use NSDM_MIG_MARC database view after now.

As seen below, after I replaced the MARC table in CDS view SELECT statement with NSDM_MIG_MARC view, I got rid of the ATC error message.

ABAP CDS View SQL code for MARC database table

A better approach might be using the proxy object for MARC SAP database table as mentioned in the ATC check error.

To find the proxy object of an SAP database table follow steps:
Display MARC table using SE11 ABAP transaction.
Using top menu follow Extras > Proxy Object... menu options to display proxy object for MARC transparent table.

proxy object for MARC database table

Here is the proxy object for MARC

display proxy object for MARC SAP table on S/4HANA

Unfortunately this proxy object cannot be used like a view.
So ABAP programmer cannot display NSDM_E_MARC proxy object using SE11 tcode.
In case, developer searches ABAP Dictionary for proxy object, the message will be "Please use the ADT Tools in Eclipse to display DDL sources"

On the other hand, we can find the CDS view name for the proxy object as follows:
Query DDLDEPENDENCY (DD: Objects in a DDL Source) transparent table for NSDM_E_MARC proxy object as filter criteria for ObjectName column.

query DDLDependency SAP table for proxy object of MARC ABAP table

Get the DDLNAME, for example NSDM_DDL_MARC in this case

DDL source name of MARC table proxy object

And search DDLDependency table using DDLName filter this time as follows

find CDS view name using DDL name

When you execute the filter criteria, the row column ObjectName gives us the CDS View name where the ObjectType as VIEW

ABAP CDS View name for proxy object of MARC

Then you can use SE11 transaction to display NSDM_V_MARC CDS view

SAP CDS View of MARC database table proxy object

And double click on DDL Source NSDM_DDL_MARC to display its source code

CDS View SQL source codes for MARC proxy object