interface failing when executing from process model

in Appian designer, the interface works fine.  but when I start it from a process model it fails.

From the Process Model:

passing ri!certificateID = 1

                      a!gridField(
                        label: "Event Calendar",
                        labelPosition: "ABOVE",
                        data: a!queryEntity(
                          entity: cons!CTR_CERTCALENDAR_DSE,
                          query: a!query(
                            selection: a!querySelection(
                              columns: {
                                a!queryColumn(
                                  field: "calstatuscd"
                                ),
                                a!queryColumn(
                                  field: "caldtfr"
                                ),
                                a!queryColumn(
                                  field: "caldtto"
                                ),
                                a!queryColumn(
                                  field: "calnotifytp"
                                ),
                                a!queryColumn(
                                  field: "id"
                                )
                              }
                            ),
                            logicalExpression: a!queryLogicalExpression(
                              operator: "AND",
                              filters: {
                                a!queryFilter(
                                  field: "certificateid",
                                  operator: "=",
                                  value: ri!Certificateid
                                )
                              },
                              ignoreFiltersWithEmptyValues: true
                            ),
                            pagingInfo: fv!pagingInfo
                          ),
                          fetchTotalCount: true
                        ),
                        columns: {
                          a!gridColumn(
                            label: "Status",
                            sortField: "calstatuscd",
                            value: fv!row.calstatuscd,
                            align: "CENTER"
                          ),
                          a!gridColumn(
                            label: "From",
                            sortField: "caldtfr",
                            value: fv!row.caldtfr,
                            align: "CENTER"
                          ),
                          a!gridColumn(
                            label: "To",
                            sortField: "caldtto",
                            value: fv!row.caldtto,
                            align: "CENTER"
                          ),
                          a!gridColumn(
                            label: "Sequence",
                            sortField: "calnotifytp",
                            value: fv!row.calnotifytp,
                            align: "CENTER"
                          )
                        },
                        initialsorts: a!sortInfo(
                          field: "caldtfr",
                          ascending: true
                        ),
                        validations: {},
                        showwhen:false()
                      )