You can use the SQLExecutor and some SQL to alter the table definition with relationships:

https://docs.microsoft.com/en-us/office/vba/access/concepts/structured-query-language/define-relationships-between-tables-using-access-sql

Thanks, Dave: I was looking into that but ran into an error. I was trying to execute the SQL after translation...

See syntax below:

Creating reader for format: Microsoft Access (JDBC)

Trying to find a JAVA plugin for reader named `MSACCESS_JDBC'

Using Java Reader Interface Version 2.0 (Oct 31, 2000) with module MSACCESS_JDBC to read data

MS Access (JDBC) Reader: Preloading JDBC Driver Class 'net.ucanaccess.jdbc.UcanaccessDriver'

MS Access (JDBC) Reader: Creating connection using connection string 'jdbc:ucanaccess://F:\\\\TestDatasets\\Test3.mdb' and properties '{jackcessOpener=COM.safe.fme.jdbc.msaccess.MsAccessCryptCodecOpener, immediatelyReleaseResources=true}'

MS Access (JDBC) Reader: Connected to 'UCanAccess driver for Microsoft Access databases using HSQLDB' version 'V2010 VERSION_14]' using driver 'Ucanaccess' version '4.0.2' built against JDBC version '4.0'

MS Access (JDBC) Reader: Connection class 'net.ucanaccess.jdbc.UcanaccessConnection' is being loaded from '/C:/Program Files (x86)/FME/plugins/ucanaccess-4.0.2.jar'

MS Access (JDBC) Reader: Executing SQL: Alter table MH_Inspections]

add constraint FK_MH_Inspecitons_Media Foreign key ((InspectionID]) references MH_Inspections_Media] ((InspectionID]);

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.2 a UNIQUE constraint does not exist on referenced columns: MH_INSPECTIONS_MEDIA in statement Alter table MH_INSPECTIONS

add constraint FK_MH_Inspecitons_Media Foreign key ( INSPECTIONID ) references MH_INSPECTIONS_MEDIA ( INSPECTIONID )]

Thanks for the tip-- I had the relationship done backwards in the syntax. I am testing replacing the access writer with a feature writer and passing it to the SQL Executer transformer.. it seemed to work on the first test-- just a couple of tables. I just don't get it why it would not work with the "SQL to Run after Write" under advanced parameters.