3800066 - Error in class CL_CFD_ENH_CDS_ENH_ABSTRACT: "TYPE type' can only be specified once"

While attempt to implement an SAP Note in Note Assistant (with all prerequisite notes are implemented), face an error in class CL_CFD_ENH_CDS_ENH_ABSTRACT:

"1 errors for class CL_CFD_ENH_CDS_ENH_ABSTRACT, Private section.
The addition '... TYPE type' can only be specified once."

SAP S/4HANA

snote, note assistant, simplification item checks, activation error, abap syntax error, private section, class cl_cfd_enh_cds_enh_abstract, cds enhancement, custom fields, prerequisite missing, type addition can only be specified once, implementation error, digitally signed notes, revamped note assistant , KBA , BC-SRV-APS-EXT-FLD , Custom Fields , CA-TRS-PRCK , S/4HANA Conversion Pre-Checks , SV-SCS-S4R , SAP Readiness Check , Problem