The Disclosures Tribunal has heard that the father of the girl who made the original complaint against Sergeant Maurice McCabe was moved to other garda duties after issues highlighted by Sgt McCabe.
The disciplinary procedure happened in 2006, before Ms D made the complaint about Sgt McCabe in December 2006.
Ms D's father was a Garda colleague of Sgt McCabe.
The tribunal, chaired by Supreme Court Justice Peter Charleton, is examining allegations that senior gardaí were involved in a smear campaign against Sgt McCabe, among other issues.
Senior Counsel Patrick Marrinan for the Tribunal said that in January 2016, solicitors for Sgt McCabe responded to a letter from the child and family agency Tusla informing him of a serious sexual abuse allegation made against him.
In this letter, his solicitors said that in 2006 Sgt McCabe became aware of "serious misbehaviour" on the part of Ms D's father and he made a complaint against the father.
Mr Marrinan said that the result was that Ms D's father lost his then position and reverted to other duties within the gardaí. He said that it was only after this that Ms D made the complaint against Sgt McCabe.
The Tribunal heard further evidence today from Tusla area manager Gerard Lowry. He denied that the gardaí were influencing him or Tusla and he said there was no co-ordination with the gardaí.
Mr Marrinan said that there was a suggestion that gardaí may have had some sort of input into how the allegation became more serious, and how Tusla dealt with Sgt McCabe.
He said that it could be perceived that because of the allegation, Sgt McCabe was vulnerable and it might cause him acute embarrassment if the allegation entered the public domain.
Mr Lowry said Tusla did not have contact with gardaí at any point. He said the errors were entirely to do with local management and he said he did not see any evidence of collusion, liaison or co-ordination with the gardaí.
Mr Lowry said he had dealt with the case inefficiently and he was disappointed. He had also asked for more staff for their area.
However, he said he would not rely on staff shortages to explain the errors. But he said they dealt with multiple high risk cases at any one time. He said it was too rushed and errors were made at all levels.
Five month delay in acknowledging error
Tusla has told the tribunal that it took five months to acknowledge to Sgt McCabe that an error was made and the apology issued was not prominent enough.
In January 2016, Sgt McCabe's solicitors responded to a Tusla letter pointing out that the allegation was false.
Tusla did not respond until June 2016.
Mr Lowry said that he was not focused enough to get the job done in a timely way.
Paul McGarry, senior counsel for Sgt McCabe, said the Tusla letter of June 2016 was highly disingenuous and was replete with self-justification before it got to the apology.
Mr Lowry said the apology would have been better at the top of the letter and it should have been more elaborate. He said they did not fully appreciate the impact of the situation on Sgt McCabe.
Also, lawyers for An Garda Síochána rejected an earlier suggestion that gardaí may have allowed the false allegation against Sgt McCabe to fester and that it had played into senior gardaí's hands.
SC Mícheál O'Higgins said gardaí sought clarification from Rian Counselling in 2014, as to whether a new referral was being made.
He said clarification was given and gardaí made a decision not to re-open the earlier investigation and he said that would assist in debunking the conspiracy.
Mr Justice Charleton asked Mr Lowry why Tusla could not stop the error as he said the gardaí were able to halt it.
Mr Lowry said they could have but he said there was momentum. At any stage, it could have been removed, reviewed and halted.
Mr Justice Charleton also asked Mr Lowry about his reference to a "no blame" culture. Mr Justice Charleton asked what that meant in "management speak".
Mr Lowry said it was that people could come forward and admit their mistakes.
