Did you read the function module documentation for BAPI_FIXEDASSET_GETLIST? It explains how to use the SELECTIONCRITERIA parameter - you have to specify a PARAMETER in addition to the field name. So if you want to select by evaluation group 1, which is included in the ALLOCATIONS table parameter of the BAPI, you must specify PARAMETER = 'ALLOCATIONS' and field name = "EVALGROUP1" plus sign/option/low/high.
JIm