To create a document expectation in an execution engine plan use the following snippet

var docexpLandlordsSolicitorConfirmation = function(ev, ctx, log) {

    //use an allocation rule to get the correct participant to assign

     var allocateOdsId = actions.sharedo.GetAllocatedOdsId(ctx.sharedoId, "es-repg-allocate-to-matter-owner");

     log.Information("Allocating document expectation task to " + allocateOdsId);

     var landsolRole = Helpers.getParticipantForSharedoByRole(ctx.sharedoId, "landlords-solicitor");

     ctx.landsolRoleId = landsolRole ? landsolRole.participantId : "";

        var taskBuilder = actions.sharedo.BuildTask()

            .WithTitle("Confirmation Landlord's Solicitor Instructed")

            .OfType("task-activity-document-expectation")

            .ForSharedo(ctx.sharedoId)

            .Assign("primary-owner").To(allocateOdsId)

            .WithAttribute("FromRecipientId", ctx.landsolRoleId)

           // .OnComplete("setKeyDateLandlordSolicitorConfirmation")

            .WithProcessTag("REPG-SURR-DRAFT-005")

            .OnPhase("task-activity-document-expectation-filed", "setKeyDateLandlordSolicitorConfirmation")

            .WithTag("Documents and Negotiation")

            .DueOn(actions.sharedo.AddWorkingDays(DateTime.UtcNow, 5))

            .Save();

};