From time to time you can experience this error when you do search in TA RSA1. This happens because of inconsistency of between ABAP programs and DDIC elements. Usually solution is to regenerate such an programs.
One of the options is to use ABAP report TOUCHTAB. See detail in note: 162991 - Generation tools for ABAP programs where also other tools are mentioned: e.g. reports: RSGENDUMP, RSREGEN, ZRSGESUB TAs: SAMT, SGEN, etc.