Clamping straight cath after 1000 ml is drained?

A few days ago I wrote an order to straight cath an 88 y/o male with BPH q4h and PRN for discomfort/urge. Today I found an addendum that stumped me; someone had changed it to read "only pull out 1000 ml at one time." I let it go for now but I cannot find any literature supporting this. Haven't seen this before in ~5 years of nursing. Anyone have any input? Do your facilities have a similar rule?