First, it is important to clarify that "SSIS 903" is not a standalone Microsoft official error code in the same way 0x80004005 (Unspecified error) is. Instead, within the SSIS community, typically refers to a specific class of errors related to buffer memory allocation and data flow engine limitations . The full error message often resembles one of the following:
If you cannot remove a Sort component, enable and reduce the number of rows before the sort by adding a conditional split early in the pipeline. ssis 903