getting shortdump error as ‘SAPSQL_ARRAY_INSERT_DUPREC’

Hi experts,

While modifying the product quantity, getting RUNTIME ERROR error in a program SAPLCRM_SCHDELIN_DU  as ‘SAPSQL_ARRAY_INSERT_DUPREC’, We Found one std function module CRM_SCHEDLIN_UPDATE_DU , which the error is occurring at INSERT  statement.

please check the below screen shot

Please tell me how to resolve it.

Thanks in advance,

Usha