Problem with DataDBReader

Hello, all SALOME user

I try to write my own component for SALOME version 2.2.8 by using python. The loading of my predefined SPML data model and the input of data goes well. Now i would like to use and manipulate these data in my component by using DataDBReader and DataDBWriter from DATA component.

I'm able to read and write data by the following code

writer=DATAcomp.GetDBWriter(curstudy)
reader=DATAcomp.GetDBReader(curstudy)

e=writer.createEntity("MyEntity"
writer.setField_String(e,"Name",["My New Entity"])

print reader.getField(e,"Name"[0].value()
# returns My New Entity
print reader.getEntityType(e)              
# returns MyEntity
print reader.getListOfFields(e)
# returns ['Name', 'Comment', ...]

But if i try to use the following methods of DataDBReader, i will get errors.

l=reader.getEntity("MyEntity"
# returns _omnipy.invoke(self,"getEntity",...) error
l=reader.getRepresentation_Entity([e])
# returns _omnipy.invoke(self,"getRepresentation_Entity",...) error
l=reader.getPotentialValues_Entity(e,"Name"
# returns _omnipy.invoke(self,"getPotentialValues_Entity",...) error

I looked up the DATA component source code and i think those are likely bugs in those methods.

Now my question. Is it a problem of me or there real bugs in DATA component?
Especially getEntity() is very important for me.

I will be very grateful for any help to fix the problem soon.

Best regards!
A. Gommlich

P.S. Please sorry my poor English