Error of Could not reserve record on attempted line add to Capitalized Asset

Hi, I am wondering if anyone has an idea of why the following is happening and suggestions on a 'fix'.   CLient has attempted to add a line from a split invoice line to a capitalized asset.  There were 247 lines that came from the original line.  Of all the lines only 4 are creating an error message of ' Could not reserve record(...".    THe following word document displays a portion of that screen.