During S/4 HANA 1809 conversion custom code remediation the ATC check displays multiple priority 1 errors related to LFA1, LFB1, KNA1, KNB1 and VBFA tables. The check messages are as below.
1) View based on an artifact having a replacement object - This is displayed against custom views which are using above tables in JOIN condition
2) View based on a replaced artifact - This is displayed for CDS view which is using VBFA in join condition
3) Append enhancing an artifact having a proxy object - This is displayed against the append structures in above tables
In SE11->Extras->Replacement Object, there is no replacement object assigned for these tables.
Any guidance to understand and resolve this issue is appreciated.