How DAC decodes its Source System Parameters into Informatica mappings??

Hi All,
I would like to know about "How DAC decodes its Source System Parameters into Informatica mappings??".
Is it an informatica mapping? or through a file? or its internal to DAC server?
Can we say the DAC server to decode it differently i.e. can we costomize the decode process? For example
$$START_DATE - i gave "Custom Format(1950-05-21 01.23.56) @MM/DD/YYYY" at dac - and it decodes as '05/21/1950' but I want it to decode as TO_DATE('05/21/1950','MM/DD/YYYY') is this possible?
Note that the informatica mapping takes the first decoding '05/21/1950' as number and through a sql error.....
Thanks for your time......
DK

Please set the values of $$FILTER_BY_SET_OF_BOOKS_ID, $$SET_OF_BOOKS_ID_LIST in DAC and check if the values get reflected in the parameter files that DAC generates for informatica at run time.
If this does'nt work, see if the BI services were restarted after doing change in the parameter file. The services need to be restarted in order to reflect the change.

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