i want to change workitem's status using n-action

i have tried to change status for workitems in uwl using n-action.

but i got status code - 0x0123(No such action).

i am new to dicom and couldn’t find references about changing workitem’s status with pynetdicom.

please let me know what is the problem in below code.

or are there examples?

thank you in advance.

n-action document: http://dicom.nema.org/dicom/2013/output/chtml/part04/sect_CC.2.html

    from pydicom.dataset import Dataset
    from pynetdicom import AE
    from pynetdicom.sop_class import (
        UnifiedProcedureStepPushSOPClass
    )
    from pynetdicom.presentation import (
        UnifiedProcedurePresentationContexts
    )
    from pydicom.uid import generate_uid

    ae = AE(ae_title='calling_ae')
    assoc = ae.associate(
        ip,
        port,
        contexts=UnifiedProcedurePresentationContexts,
        ae_title='called_ae'
    )
    ds = Dataset()
    ds.TransactionUID = generate_uid()
    ds.ProcedureStepState = 'IN PROGRESS'
    (status, reply) = assoc.send_n_action(
        ds,
        1,
        UnifiedProcedureStepPushSOPClass,
        sop_instance_uid
    )

    assoc.release()

[scaramallion]

OK, I think this is a pynetdicom issue. The DICOM Standard says:

An SCU uses N-ACTION to ask the SCP to change the state of a UPS Instance as shown in Figure CC.1.1-1. Since all UPSs are created as instances of the UPS Push SOP Class, the Requested SOP Class UID (0000,0003) in the N-ACTION request shall be the UID of the UPS Push SOP Class. See Section CC.3.1 for further details.

In essence, dcm4chee wants the requested presentation context to be UPS Pull and the N-ACTION-RQ’s Requested SOP Class UID to be UPS Push. pynetdicom doesn’t allow that with Association.send_n_action(), when I patch it then everything works as expected. dcm4chee doesn’t like having an association with all the UPS presentation contexts, either, it just wants one.

I’ll double check my reasoning and probably put out a patch release. If you need it working sooner rather than later then this branch should work with:

def set_in_progress(instance_uid):
    ae = AE()

    ae.add_requested_context(UnifiedProcedureStepPullSOPClass)

    ds = Dataset()
    ds.TransactionUID = generate_uid()
    ds.ProcedureStepState = 'IN PROGRESS'

    assoc = ae.associate('localhost', 11112, ae_title=b"DCM4CHEE")
    if assoc.is_established:
        (status, reply) = assoc.send_n_action(
            ds, 1,
            UnifiedProcedureStepPushSOPClass,
            instance_uid,
        )
        print(f"In-progress: 0x{status.Status:04X}")

        assoc.release()

[scaramallion]

Thanks!