Hi Madhu,
at PSA Level 0Customer may have invalid char like '#' '/' or space, or lower case letters kind. first find out invalid char data and edit psa and relaod master data for 0customer.this error may repeat every day when master data load happens. so with help source team, make corrections in ecc and load to psa.
For lower case issue, you can select lowercase check box at info object level. you can usee T-Code - RSKC to maintain special chars,
ALL_CAPITAL_PLUS_HEX
please share the error log details or screen shot.
http://scn.sap.com/docs/DOC-40684
Thanks