Profile Generic - Billing and Load Survey data reading

Hi GuruX Team,

I am using gurux .Net library to read dlms meter data, Meter Used - Sumeru Verde (Indian Standard - Single Phase)

Using GuruX GXDLMS director, successfully able to do the following items,
1. Read Instantaneous Parameters (Object Type : Data, Clock, Register & Extended Register)
2. Read Billing Data [1.0.98.1.0.255] (Object Type : Profile Generic)
3. Read Daily Load Survey Data [1.0.99.1.0.255] (Object Type : Profile Generic)

While using GuruX - .Net Library.,
[Successfully able to read Instantaneous Parameters]
1. Read Instantaneous Parameters (Object Type : Data, Clock, Register & Extended Register) - Successful

[Not able to read Billing and Load Profile]
2. Read Billing Data [1.0.98.1.0.255] (Object Type : Profile Generic)
entriesInUse/entries = 3/13

Case 1:
tried: object[] rows = comm.ReadRowsByEntry(it as GXDLMSProfileGeneric, 1, 1);
result: returned single billing entry
Is the billing entry is first entry? [1/13]

Case 2:
If suppose i need to read last entry from Billing profile (History),
tried: object[] rows = comm.ReadRowsByEntry(it as GXDLMSProfileGeneric, 3, 1);
object[] rows = comm.ReadRowsByEntry(it as GXDLMSProfileGeneric, 1, 3);
result : null
Which Is this a proper way to retrieve the last logged entry from Billing profile?

Case 3:
If suppose i need to read last two entry from Billing profile (History)
tried: object[] rows = comm.ReadRowsByEntry(it as GXDLMSProfileGeneric, 1, 2);
result : null
Which Is this a proper way to retrieve the last 2 logged entry from Billing profile?

Case 4:
Need to retrieve the current billing profile data (Latest).,
tried: DateTime startDate = new DateTime(2017, 1, 8);
DateTime endDate = new DateTime(2017, 1, 8);
object[] rows = comm.ReadRowsByRange(it as GXDLMSProfileGeneric, startDate, endDate);
result: Access Error : Device reports Read-Write denied.
Is this a proper way to retrieve? [Used same authentication as GXDLMS Director]

3. Read Daily Load Survey Data [1.0.99.1.0.255] (Object Type : Profile Generic)
entriesInUse/entries = 940/1680

Case 1:
Need to read last day load profile data by specifying date range
tried: DateTime startDate = new DateTime(2017, 1, 7);
DateTime endDate = new DateTime(2017, 1, 8);
object[] rows = comm.ReadRowsByRange(it as GXDLMSProfileGeneric, startDate, endDate);
result: Access Error : Device reports Read-Write denied.
Is this a proper way to retrieve? [Used same authentication as GXDLMS Director]

Please clarify the above mentioned cases.
Also mailed the GXDMLSDirector Log file for reference.

Your valued reply is appreciated.

Regards,
Sathappa