SAP Message 5P218 - &: Sequence no. is not within the set of values: '9' is the last number

Diagnosis You have used the NEXTR operation and would like to move to a new line.The number in the line containing the NEXTR operation is 9. You havenot specified a sequential number for the operation itself. Since'9' is the last valid value within the range, an error message isdisplayed. Procedure - You have forgotten a number or letter in the operation. - If you have used all valid letters and numbers, you must move to asubfeature.