Updating UD Field in Receipt Detal Attribute Value Set Table

Has anyone ever written to a UD field in the RcvDtlAttrValueSet table (new table added in 2021.1)?

I have a Customization in Inspection Processing that looked at the ‘porView’ view for a UD Checkbox to be true and then displayed a shape. In 2021.1, per support KB0119682, the ‘porView’ now looks to this new table instead of RcvDtl.

I have created an In-Transaction Data Directive against the RcvDtlAttrValueSet and tried multiple ways to look for the corresponding RcvDtl record and set the Checkbox accordingly, but nothing is working.

Any guidance is appreciated. Thanks in advance.