Issues with Dynamic Menu on Transaction Line

Summary:

Hi,

I have created a Dynamic Menu at the Transaction Line level. The menu points to a live data table which looks something like this:

The filter on the Dynamic Menu attribute is something like this:

{OptyId:"|opportunityID_t|"}

However, when I added this attribute at the line level, it works fine only if lines exist already, i.e., works well for quotes that were already created with line items. But for newer quotes, it causes some issues. Mainly, the "Quick Add" button gets disabled and the "Add Line Item" button to add items for model throws an "Internal Server Error".