Message SAP /ISDFPS/FDP135 - Error deleting infotype &1 subtype &2 to &3 &4

Diagnosis
For at least one force element or position to be deleted, there is arelationship (wartime, administrative chain of command, operation, orexercise) for the object specified (force element (O), position (S), orperson (P)). This object is not part of the object quantity to bedeleted. To ensure data consistency, the relationship specified mustalso be deleted.
This relationship is an external relationship, which is stored in eitherinfotype 1955 or infotype 1985. Infotype 1955 contains all relationshipsfor wartime establishment (subtype V*) and for the administrative chainof command (subtype T*). Infotype 1985 contains all relationships forthe operational (subtype E*) or exercise (subtype U*) structure.
An error occurred when deleting the record specified.

System Response
The entire deletion activity is terminated.

Procedure
Delete the record separately. Resolve any errors. Then run thestructural deletion activity again.