In this appeal, defendants bring forth three assignments of error. First, defendants contend that the trial court erred in denying their motions for directed verdict and judgment notwithstanding the verdict. Second, defendants contend that the trial court erred in allowing plaintiff’s witness to testify in the form of an opinion on the ultimate issue in this case. Third, defendants contend that the trial court erred in failing to grant their motion for Rule 11 sanctions against plaintiff. We disagree and accordingly find no error.

*800Regarding defendants’ first assignment of error, we initially note that defendants introduced evidence after their motion for directed verdict was denied. By introducing evidence, defendants waived their G.S. 1A-1, Rule 50(a) motion for directed verdict made at the close of plaintiff’s evidence. Rice v. Wood, 82 N.C. App. 318, 346 S.E.2d 205, disc. review denied, 318 N.C. 417, 349 S.E.2d 599 (1986). Defendants failed to renew their motion for directed verdict at the close of all evidence. “A motion for directed verdict at the close of all evidence is an absolute prerequisite to the post verdict motion for judgment notwithstanding the verdict. G.S. 1A-1, Rule 50(b)(1); Graves v. Walston, 302 N.C. 332, 338, 275 S.E.2d 485, 489 (1981).” Jansen v. Collins, 92 N.C. App. 516, 517, 374 S.E.2d 641, 643 (1988). Defendants cannot have the denial of their motion for judgment notwithstanding the verdict reviewed on appeal because they failed to renew the motion for directed verdict at the close of all evidence. Id.

Next, defendants assign as error the trial court’s admission of John Greene’s answer to the question: “Based on your conversations with [defendant] Mr. Andy Sigmon, who did you believe was responsible for paying for the materials purchased from Boone Lumber?” Greene responded, “Andy told me that the financial backing was through Ed Sigmon, their father, that he and John was [sic] operating the business and there was no problem with us being paid for account [sic].” Defendants contend that the trial court allowed plaintiff’s witness “to testify beyond concrete facts within his own knowledge, observation, and recollection . . . [and] to testify in the form of an opinion the ultimate issue in this case which was whether [defendants] were individually liable to [plaintiff] on an open account.” We disagree.

G.S. 8C-1, Rule 801(d) provides that “[a] statement is admissible as an exception to the hearsay rule if it is offered against a party and it is (A) his own statement, in either his individual or a representative capacity.” While the question may have called for an answer that embraced the ultimate issue, the answer actually given was only a recital of what defendant Andy Sigmon had told the witness. Additionally, we note that Andy Sigmon testified when defendants presented their evidence. The jury had the opportunity to weigh the credibility of both John Greene and Andy Sigmon. Accordingly, we find no prejudicial error.

*801Finally, defendants contend that the trial court erred in failing to grant their motion for Rule 11 sanctions against plaintiff because of an alleged contradiction between John Greene’s affidavit and his subsequent testimony at trial. “The trial court’s decision to impose or not to impose mandatory sanctions under N.C.G.S. 1A-1, Rule 11(a) is reviewable de novo as a legal issue.” Turner v. Duke University, 325 N.C. 152, 165, 381 S.E.2d 706, 714 (1989). In his affidavit, Greene stated that he “investigated the integrity and financial condition of the individual defendants, particularly the defendant, Ed Sigmon.” At trial, Greene testified that reputable people in the community told him that Sigmon had a good reputation, that he heard on several occasions that Ed Sigmon’s “net worth” was “pretty good,” and that upon recalling his past dealings with the defendants, he found “no reason to question their [defendants’] credit.” Assuming without deciding that the execution of the affidavit is a document referred to in Rule 11, we find no contradiction and conclude that defendants’ assignment of error is without merit.

We find no error in the trial court’s denial of defendants’ motions for directed verdict and judgment notwithstanding the verdict and in the trial court’s admission of the testimony of John Greene. We affirm the trial court’s denial of Rule 11 sanctions against plaintiff.

In the trial, no error; as to Rule 11 sanctions, affirmed.