A police lab worker wrote the wrong case number on a form relating to one of the men accused of murdering Stephen Lawrence, a court has heard.
Forensic assistant Yvonne Turner admitted she "wasn't concentrating" when she started examining a jacket belonging to suspect Gary Dobson.
On October 28, 1993 she had been asked to look at a woolly hat and a baseball cap linked to a separate robbery case, as well as Dobson's jacket. The Old Bailey heard that she wrote the case number linked to the robbery at the top of the form for the jacket.
She told the court: "I wasn't concentrating and I wasn't focused at the stage when I wrote the case number in, but I've clearly got to grips with the case as I've written the correct item number."
Dobson, 36, and David Norris, 35, both of south London, are accused of murdering Mr Lawrence, which they deny.
Ms Turner also gave a detailed account of the tests for blood and fibres that she carried out on the Raiders jacket that Mr Lawrence wore on the night he died. Working at a laboratory in Lambeth, south London, she noted bloodstains and stab holes in the fabric.
Earlier the court was told that exhibits relating to five people originally suspected of the murder were stored in the same room at Eltham police station where Stephen Lawrence's clothing had previously been kept.
Clothes belonging to Dobson, Norris and two other men not on trial - Neil and Jamie Acourt - were all stored in the disused cell, which was used as an exhibit store. Some belonging to a fifth unnamed suspect were also kept there later, the court heard.
Exhibits officer Detective Constable Robert Crane was asked if the suspects' items could have been kept in the same area where Mr Lawrence's clothes had been days before. He said: "I think not. In any event, every item has gone into that cell sealed."
The trial continues.