BEX Error: Abort system error in program CL_RSR_GRID and form FILL_AXIS_SET

Hello together,

when we try to change the display setting of a charactrestic in BEx, for example from "display as key" to "display as key and text" we get the following error message:

"Abort system error in program CL_RSR_GRID and form FILL_AXIS_SETXX_LINE:TXT_N_M"

and BEx looses server connection.

Does anybody know what the problem is and how to solve it?

Thank you very much

Johannes