SAPSQL_ILLEGAL_DISTINCT is an ABAP runtime error which you may come across when using or developing within an SAP system. See below for the standard details explaining what it means and how you can avoid or fix this runtime error.
Short Dump Classification: A - ABAP Programming Error
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Selection with the addition "DISTINCT" at pool or cluster table.
Please see abap error for more details about the possible cause of this runtime error and how it could be avoided.
The addition "DISTINCT" cannot be used with SELECT statements for pool
and cluster tables.
Please see abap error for more details about the possible cause of this runtime error and how it could be avoided.