Laura Muir was forced to defend herself after being accused of playing games ahead of her British Championships win.
The Scot won the 800 metres to claim the British title in Birmingham on Sunday, but her rivals were unhappy with what they perceived to be a lack of clarity.
Lynsey Sharp, who came fifth to put her European Championships spot at risk, appeared to accuse Muir of dirty tricks and felt British Athletics had allowed her to enter after the deadline.
Muir, who won with a time of 02:01.22, could also face a protest but any action is likely to be rejected.
The start list did not update online following last Monday’s entry deadline, despite Muir entering 24 hours beforehand, but, with a European Championships place on the line, Sharp hit out.
Sharp, who could still earn a discretionary place on the team for Berlin in August, said: “Games have been played all week by individuals and our governing body which is meant to be unbiased.
“You can call me bitter, but I play by the rules and I came here prepared based on what I knew the field was going to be and that was different on Saturday morning.”
Data shows Muir, who also entered the 1500m but did not race, did register on time.
She said: “We accepted the entry for the 800m over a week ago. It just didn’t update online. It’s always been in our minds to do the 800m. I think some of them maybe knew.
“Some of them knew from having raced in Oslo. I’m European lead in both 800m and 1500m, so I don’t know if it’s a huge surprise for me to do the 800m. I’m a strong contender in that event.”
A statement from British Athletics read: “British Athletics can confirm that no athlete entered in the women’s 800m has been granted late entry or showed favouritism in any manner in the lead-up to this weekend’s championships.
“We have data that shows the time and date of all athletes’ entry confirmations, with all competing at this weekend’s championships submitting their online forms on or before the closing date of Monday 25 June.”
Elsewhere, Nethaneel Mitchell-Blake beat Adam Gemili to the 200m crown.
Andrew Pozzi regained the 110m hurdles British title in 13.61s, but Katarina Johnson-Thompson came 13th in the javelin with 39.98m after her silver medal in the high jump on Saturday.
The 25-year-old is aiming for a hat-trick of titles this year ahead of August’s Euros in Berlin after the world indoor pentathlon crown and Commonwealth Games heptathlon gold.
“I’ve not done anything for a couple of months. I’m against specialists in the javelin but it gives me a good chance to build on that,” she said.
“I have five weeks (to Berlin) and that’ll be enough.”
Dai Greene, who has endured years of injury problems, won the 400m hurdles in 50.06.
The 2011 world champion missed the Commonwealth Games for Wales after tearing his hamstring in training just days before the start.
He said: “The aim was to get to Europeans. I haven’t raced much and I still feel a bit rusty. I don’t know I have the ability to get onto the podium.”
Beth Dobbin won the women’s 200m, while Chris O’Hare triumphed in the men’s 1500m.